clang-p2996/bolt/docs/CommandLineArgumentReference.md

BOLT - a post-link optimizer developed to speed up large applications

SYNOPSIS

llvm-bolt <executable> [-o outputfile] <executable>.bolt [-data=perf.fdata] [options]

OPTIONS

Generic options:

• -h

  Alias for --help

• --help

  Display available options (--help-hidden for more)

• --help-hidden

  Display all available options

• --help-list

  Display list of available options (--help-list-hidden for more)

• --help-list-hidden

  Display list of all available options

• --version

  Display the version of this program

Output options:

• --bolt-info

  Write bolt info section in the output binary

• -o <string>

  output file

• -w <string>

  Save recorded profile to a file

BOLT generic options:

• --align-text=<uint>

  Alignment of .text section

• --allow-stripped

  Allow processing of stripped binaries

• --alt-inst-feature-size=<uint>

  Size of feature field in .altinstructions

• --alt-inst-has-padlen

  Specify that .altinstructions has padlen field

• --asm-dump[=<dump folder>]

  Dump function into assembly

• -b

  Alias for -data

• --bolt-id=<string>

  Add any string to tag this execution in the output binary via bolt info section

• --break-funcs=<func1,func2,func3,...>

  List of functions to core dump on (debugging)

• --check-encoding

  Perform verification of LLVM instruction encoding/decoding. Every instruction in the input is decoded and re-encoded. If the resulting bytes do not match the input, a warning message is printed.

• --comp-dir-override=<string>

  Overrides DW_AT_comp_dir, and provides an alterantive base location, which is used with DW_AT_dwo_name to construct a path to *.dwo files.

• --create-debug-names-section

  Creates .debug_names section, if the input binary doesn't have it already, for DWARF5 CU/TUs.

• --cu-processing-batch-size=<uint>

  Specifies the size of batches for processing CUs. Higher number has better performance, but more memory usage. Default value is 1.

• --data=<string>

  data file

• --data2=<string>

  data file

• --debug-skeleton-cu

  Prints out offsets for abbrev and debug_info of Skeleton CUs that get patched.

• --deterministic-debuginfo

  Disables parallel execution of tasks that may produce nondeterministic debug info

• --dot-tooltip-code

  Add basic block instructions as tool tips on nodes

• --dump-alt-instructions

  Dump Linux alternative instructions info

• --dump-cg=<string>

  Dump callgraph to the given file

• --dump-data

  Dump parsed bolt data for debugging

• --dump-dot-all

  Dump function CFGs to graphviz format after each stage;enable '-print-loops' for color-coded blocks

• --dump-linux-exceptions

  Dump Linux kernel exception table

• --dump-orc

  Dump raw ORC unwind information (sorted)

• --dump-para-sites

  Dump Linux kernel paravitual patch sites

• --dump-pci-fixups

  Dump Linux kernel PCI fixup table

• --dump-smp-locks

  Dump Linux kernel SMP locks

• --dump-static-calls

  Dump Linux kernel static calls

• --dump-static-keys

  Dump Linux kernel static keys jump table

• --dwarf-output-path=<string>

  Path to where .dwo files or dwp file will be written out to.

• --dwp=<string>

  Path and name to DWP file.

• --dyno-stats

  Print execution info based on profile

• --dyno-stats-all

  Print dyno stats after each stage

• --dyno-stats-scale=<uint>

  Scale to be applied while reporting dyno stats

• --enable-bat

  Write BOLT Address Translation tables

• --force-data-relocations

  Force relocations to data sections to always be processed

• --force-patch

  Force patching of original entry points

• --funcs=<func1,func2,func3,...>

  Limit optimizations to functions from the list

• --funcs-file=<string>

  File with list of functions to optimize

• --funcs-file-no-regex=<string>

  File with list of functions to optimize (non-regex)

• --funcs-no-regex=<func1,func2,func3,...>

  Limit optimizations to functions from the list (non-regex)

• --hot-data

  Hot data symbols support (relocation mode)

• --hot-functions-at-end

  If reorder-functions is used, order functions putting hottest last

• --hot-text

  Generate hot text symbols. Apply this option to a precompiled binary that manually calls into hugify, such that at runtime hugify call will put hot code into 2M pages. This requires relocation.

• --hot-text-move-sections=<sec1,sec2,sec3,...>

  List of sections containing functions used for hugifying hot text. BOLT makes sure these functions are not placed on the same page as the hot text. (default='.stub,.mover').

• --insert-retpolines

  Run retpoline insertion pass

• --keep-aranges

  Keep or generate .debug_aranges section if .gdb_index is written

• --keep-tmp

  Preserve intermediate .o file

• --lite

  Skip processing of cold functions

• --log-file=<string>

  Redirect journaling to a file instead of stdout/stderr

• --long-jump-labels

  Always use long jumps/nops for Linux kernel static keys

• --max-data-relocations=<uint>

  Maximum number of data relocations to process

• --max-funcs=<uint>

  Maximum number of functions to process

• --no-huge-pages

  Use regular size pages for code alignment

• --no-threads

  Disable multithreading

• --pad-funcs=<func1:pad1,func2:pad2,func3:pad3,...>

  List of functions to pad with amount of bytes

• --profile-format=<value>

  Format to dump profile output in aggregation mode, default is fdata

  • fdata: offset-based plaintext format
  • yaml: dense YAML representation

• --r11-availability=<value>

  Determine the availability of r11 before indirect branches

  • never: r11 not available
  • always: r11 available before calls and jumps
  • abi: r11 available before calls but not before jumps

• --relocs

  Use relocations in the binary (default=autodetect)

• --remove-symtab

  Remove .symtab section

• --reorder-skip-symbols=<symbol1,symbol2,symbol3,...>

  List of symbol names that cannot be reordered

• --reorder-symbols=<symbol1,symbol2,symbol3,...>

  List of symbol names that can be reordered

• --retpoline-lfence

  Determine if lfence instruction should exist in the retpoline

• --skip-funcs=<func1,func2,func3,...>

  List of functions to skip

• --skip-funcs-file=<string>

  File with list of functions to skip

• --strict

  Trust the input to be from a well-formed source

• --tasks-per-thread=<uint>

  Number of tasks to be created per thread

• --terminal-trap

  Assume that execution stops at trap instruction

• --thread-count=<uint>

  Number of threads

• --top-called-limit=<uint>

  Maximum number of functions to print in top called functions section

• --trap-avx512

  In relocation mode trap upon entry to any function that uses AVX-512 instructions

• --trap-old-code

  Insert traps in old function bodies (relocation mode)

• --update-debug-sections

  Update DWARF debug sections of the executable

• --use-gnu-stack

  Use GNU_STACK program header for new segment (workaround for issues with strip/objcopy)

• --use-old-text

  Re-use space in old .text if possible (relocation mode)

• -v <uint>

  Set verbosity level for diagnostic output

• --write-dwp

  Output a single dwarf package file (dwp) instead of multiple non-relocatable dwarf object files (dwo).

BOLT optimization options:

• --align-blocks

  Align basic blocks

• --align-blocks-min-size=<uint>

  Minimal size of the basic block that should be aligned

• --align-blocks-threshold=<uint>

  Align only blocks with frequency larger than containing function execution frequency specified in percent. E.g. 1000 means aligning blocks that are 10 times more frequently executed than the containing function.

• --align-functions=<uint>

  Align functions at a given value (relocation mode)

• --align-functions-max-bytes=<uint>

  Maximum number of bytes to use to align functions

• --assume-abi

  Assume the ABI is never violated

• --block-alignment=<uint>

  Boundary to use for alignment of basic blocks

• --bolt-seed=<uint>

  Seed for randomization

• --cg-from-perf-data

  Use perf data directly when constructing the call graph for stale functions

• --cg-ignore-recursive-calls

  Ignore recursive calls when constructing the call graph

• --cg-use-split-hot-size

  Use hot/cold data on basic blocks to determine hot sizes for call graph functions

• --cold-threshold=<uint>

  Tenths of percents of main entry frequency to use as a threshold when evaluating whether a basic block is cold (0 means it is only considered cold if the block has zero samples). Default: 0

• --elim-link-veneers

  Run veneer elimination pass

• --eliminate-unreachable

  Eliminate unreachable code

• --equalize-bb-counts

  Use same count for BBs that should have equivalent count (used in non-LBR and shrink wrapping)

• --execution-count-threshold=<uint>

  Perform profiling accuracy-sensitive optimizations only if function execution count >= the threshold (default: 0)

• --fix-block-counts

  Adjust block counts based on outgoing branch counts

• --fix-func-counts

  Adjust function counts based on basic blocks execution count

• --force-inline=<func1,func2,func3,...>

  List of functions to always consider for inlining

• --frame-opt=<value>

  Optimize stack frame accesses

  • none: do not perform frame optimization
  • hot: perform FOP on hot functions
  • all: perform FOP on all functions

• --frame-opt-rm-stores

  Apply additional analysis to remove stores (experimental)

• --function-order=<string>

  File containing an ordered list of functions to use for function reordering

• --generate-function-order=<string>

  File to dump the ordered list of functions to use for function reordering

• --generate-link-sections=<string>

  Generate a list of function sections in a format suitable for inclusion in a linker script

• --group-stubs

  Share stubs across functions

• --hugify

  Automatically put hot code on 2MB page(s) (hugify) at runtime. No manual call to hugify is needed in the binary (which is what --hot-text relies on).

• --icf

  Fold functions with identical code

• --icp

  Alias for --indirect-call-promotion

• --icp-calls-remaining-percent-threshold=<uint>

  The percentage threshold against remaining unpromoted indirect call count for the promotion for calls

• --icp-calls-topn

  Alias for --indirect-call-promotion-calls-topn

• --icp-calls-total-percent-threshold=<uint>

  The percentage threshold against total count for the promotion for calls

• --icp-eliminate-loads

  Enable load elimination using memory profiling data when performing ICP

• --icp-funcs=<func1,func2,func3,...>

  List of functions to enable ICP for

• --icp-inline

  Only promote call targets eligible for inlining

• --icp-jt-remaining-percent-threshold=<uint>

  The percentage threshold against remaining unpromoted indirect call count for the promotion for jump tables

• --icp-jt-targets

  Alias for --icp-jump-tables-targets

• --icp-jt-topn

  Alias for --indirect-call-promotion-jump-tables-topn

• --icp-jt-total-percent-threshold=<uint>

  The percentage threshold against total count for the promotion for jump tables

• --icp-jump-tables-targets

  For jump tables, optimize indirect jmp targets instead of indices

• --icp-mp-threshold

  Alias for --indirect-call-promotion-mispredict-threshold

• --icp-old-code-sequence

  Use old code sequence for promoted calls

• --icp-top-callsites=<uint>

  Optimize hottest calls until at least this percentage of all indirect calls frequency is covered. 0 = all callsites

• --icp-topn

  Alias for --indirect-call-promotion-topn

• --icp-use-mp

  Alias for --indirect-call-promotion-use-mispredicts

• --indirect-call-promotion=<value>

  Indirect call promotion

  • none: do not perform indirect call promotion
  • calls: perform ICP on indirect calls
  • jump-tables: perform ICP on jump tables
  • all: perform ICP on calls and jump tables

• --indirect-call-promotion-calls-topn=<uint>

  Limit number of targets to consider when doing indirect call promotion on calls. 0 = no limit

• --indirect-call-promotion-jump-tables-topn=<uint>

  Limit number of targets to consider when doing indirect call promotion on jump tables. 0 = no limit

• --indirect-call-promotion-topn=<uint>

  Limit number of targets to consider when doing indirect call promotion. 0 = no limit

• --indirect-call-promotion-use-mispredicts

  Use misprediction frequency for determining whether or not ICP should be applied at a callsite. The -indirect-call-promotion-mispredict-threshold value will be used by this heuristic

• --infer-fall-throughs

  Infer execution count for fall-through blocks

• --infer-stale-profile

  Infer counts from stale profile data.

• --inline-all

  Inline all functions

• --inline-ap

  Adjust function profile after inlining

• --inline-limit=<uint>

  Maximum number of call sites to inline

• --inline-max-iters=<uint>

  Maximum number of inline iterations

• --inline-memcpy

  Inline memcpy using 'rep movsb' instruction (X86-only)

• --inline-small-functions

  Inline functions if increase in size is less than defined by -inline-small- functions-bytes

• --inline-small-functions-bytes=<uint>

  Max number of bytes for the function to be considered small for inlining purposes

• --instrument

  Instrument code to generate accurate profile data

• --iterative-guess

  In non-LBR mode, guess edge counts using iterative technique

• --jt-footprint-optimize-for-icache

  With jt-footprint-reduction, only process PIC jumptables and turn off other transformations that increase code size

• --jt-footprint-reduction

  Make jump tables size smaller at the cost of using more instructions at jump sites

• --jump-tables=<value>

  Jump tables support (default=basic)

  • none: do not optimize functions with jump tables
  • basic: optimize functions with jump tables
  • move: move jump tables to a separate section
  • split: split jump tables section into hot and cold based on function execution frequency
  • aggressive: aggressively split jump tables section based on usage of the tables

• --keep-nops

  Keep no-op instructions. By default they are removed.

• --lite-threshold-count=<uint>

  Similar to '-lite-threshold-pct' but specify threshold using absolute function call count. I.e. limit processing to functions executed at least the specified number of times.

• --lite-threshold-pct=<uint>

  Threshold (in percent) for selecting functions to process in lite mode. Higher threshold means fewer functions to process. E.g threshold of 90 means only top 10 percent of functions with profile will be processed.

• --memcpy1-spec=<func1,func2:cs1:cs2,func3:cs1,...>

  List of functions with call sites for which to specialize memcpy() for size 1

• --min-branch-clusters

  Use a modified clustering algorithm geared towards minimizing branches

• --no-inline

  Disable all inlining (overrides other inlining options)

• --no-scan

  Do not scan cold functions for external references (may result in slower binary)

• --peepholes=<value>

  Enable peephole optimizations

  • none: disable peepholes
  • double-jumps: remove double jumps when able
  • tailcall-traps: insert tail call traps
  • useless-branches: remove useless conditional branches
  • all: enable all peephole optimizations

• --plt=<value>

  Optimize PLT calls (requires linking with -znow)

  • none: do not optimize PLT calls
  • hot: optimize executed (hot) PLT calls
  • all: optimize all PLT calls

• --preserve-blocks-alignment

  Try to preserve basic block alignment

• --profile-ignore-hash

  Ignore hash while reading function profile

• --profile-use-dfs

  Use DFS order for YAML profile

• --reg-reassign

  Reassign registers so as to avoid using REX prefixes in hot code

• --reorder-blocks=<value>

  Change layout of basic blocks in a function

  • none: do not reorder basic blocks
  • reverse: layout blocks in reverse order
  • normal: perform optimal layout based on profile
  • branch-predictor: perform optimal layout prioritizing branch predictions
  • cache: perform optimal layout prioritizing I-cache behavior
  • cache+: perform layout optimizing I-cache behavior
  • ext-tsp: perform layout optimizing I-cache behavior
  • cluster-shuffle: perform random layout of clusters

• --reorder-data=<section1,section2,section3,...>

  List of sections to reorder

• --reorder-data-algo=<value>

  Algorithm used to reorder data sections

  • count: sort hot data by read counts
  • funcs: sort hot data by hot function usage and count

• --reorder-data-inplace

  Reorder data sections in place

• --reorder-data-max-bytes=<uint>

  Maximum number of bytes to reorder

• --reorder-data-max-symbols=<uint>

  Maximum number of symbols to reorder

• --reorder-functions=<value>

  Reorder and cluster functions (works only with relocations)

  • none: do not reorder functions
  • exec-count: order by execution count
  • hfsort: use hfsort algorithm
  • hfsort+: use cache-directed sort
  • cdsort: use cache-directed sort
  • pettis-hansen: use Pettis-Hansen algorithm
  • random: reorder functions randomly
  • user: use function order specified by -function-order

• --reorder-functions-use-hot-size

  Use a function's hot size when doing clustering

• --report-bad-layout=<uint>

  Print top functions with suboptimal code layout on input

• --report-stale

  Print the list of functions with stale profile

• --runtime-hugify-lib=<string>

  Specify file name of the runtime hugify library

• --runtime-instrumentation-lib=<string>

  Specify file name of the runtime instrumentation library

• --sctc-mode=<value>

  Mode for simplify conditional tail calls

  • always: always perform sctc
  • preserve: only perform sctc when branch direction is preserved
  • heuristic: use branch prediction data to control sctc

• --sequential-disassembly

  Performs disassembly sequentially

• --shrink-wrapping-threshold=<uint>

  Percentage of prologue execution count to use as threshold when evaluating whether a block is cold enough to be profitable to move eligible spills there

• --simplify-conditional-tail-calls

  Simplify conditional tail calls by removing unnecessary jumps

• --simplify-rodata-loads

  Simplify loads from read-only sections by replacing the memory operand with the constant found in the corresponding section

• --split-align-threshold=<uint>

  When deciding to split a function, apply this alignment while doing the size comparison (see -split-threshold). Default value: 2.

• --split-all-cold

  Outline as many cold basic blocks as possible

• --split-eh

  Split C++ exception handling code

• --split-functions

  Split functions into fragments

• --split-strategy=<value>

  Strategy used to partition blocks into fragments

  • profile2: split each function into a hot and cold fragment using profiling information
  • cdsplit: split each function into a hot, warm, and cold fragment using profiling information
  • random2: split each function into a hot and cold fragment at a randomly chosen split point (ignoring any available profiling information)
  • randomN: split each function into N fragments at a randomly chosen split points (ignoring any available profiling information)
  • all: split all basic blocks of each function into fragments such that each fragment contains exactly a single basic block

• --split-threshold=<uint>

  Split function only if its main size is reduced by more than given amount of bytes. Default value: 0, i.e. split iff the size is reduced. Note that on some architectures the size can increase after splitting.

• --stale-matching-max-func-size=<uint>

  The maximum size of a function to consider for inference.

• --stale-matching-min-matched-block=<uint>

  Percentage threshold of matched basic blocks at which stale profile inference is executed.

• --stale-threshold=<uint>

  Maximum percentage of stale functions to tolerate (default: 100)

• --stoke

  Turn on the stoke analysis

• --strip-rep-ret

  Strip 'repz' prefix from 'repz retq' sequence (on by default)

• --tail-duplication=<value>

  Duplicate unconditional branches that cross a cache line

  • none: do not apply
  • aggressive: aggressive strategy
  • moderate: moderate strategy
  • cache: cache-aware duplication strategy

• --tsp-threshold=<uint>

  Maximum number of hot basic blocks in a function for which to use a precise TSP solution while re-ordering basic blocks

• --use-aggr-reg-reassign

  Use register liveness analysis to try to find more opportunities for -reg- reassign optimization

• --use-compact-aligner

  Use compact approach for aligning functions

• --use-edge-counts

  Use edge count data when doing clustering

• --verify-cfg

  Verify the CFG after every pass

• --x86-align-branch-boundary-hot-only

  Only apply branch boundary alignment in hot code

• --x86-strip-redundant-address-size

  Remove redundant Address-Size override prefix

BOLT options in relocation mode:

• --align-macro-fusion=<value>

  Fix instruction alignment for macro-fusion (x86 relocation mode)

  • none: do not insert alignment no-ops for macro-fusion
  • hot: only insert alignment no-ops on hot execution paths (default)
  • all: always align instructions to allow macro-fusion

BOLT instrumentation options:

llvm-bolt <executable> -instrument [-o outputfile] <instrumented-executable>

• --conservative-instrumentation

  Disable instrumentation optimizations that sacrifice profile accuracy (for debugging, default: false)

• --instrument-calls

  Record profile for inter-function control flow activity (default: true)

• --instrument-hot-only

  Only insert instrumentation on hot functions (needs profile, default: false)

• --instrumentation-binpath=<string>

  Path to instrumented binary in case if /proc/self/map_files is not accessible due to access restriction issues

• --instrumentation-file=<string>

  File name where instrumented profile will be saved (default: /tmp/prof.fdata)

• --instrumentation-file-append-pid

  Append PID to saved profile file name (default: false)

• --instrumentation-no-counters-clear

  Don't clear counters across dumps (use with instrumentation-sleep-time option)

• --instrumentation-sleep-time=<uint>

  Interval between profile writes (default: 0 = write only at program end). This is useful for service workloads when you want to dump profile every X minutes or if you are killing the program and the profile is not being dumped at the end.

• --instrumentation-wait-forks

  Wait until all forks of instrumented process will finish (use with instrumentation-sleep-time option)

BOLT printing options:

• --print-aliases

  Print aliases when printing objects

• --print-all

  Print functions after each stage

• --print-cfg

  Print functions after CFG construction

• --print-debug-info

  Print debug info when printing functions

• --print-disasm

  Print function after disassembly

• --print-dyno-opcode-stats=<uint>

  Print per instruction opcode dyno stats and the functionnames:BB offsets of the nth highest execution counts

• --print-dyno-stats-only

  While printing functions output dyno-stats and skip instructions

• --print-exceptions

  Print exception handling data

• --print-globals

  Print global symbols after disassembly

• --print-jump-tables

  Print jump tables

• --print-loops

  Print loop related information

• --print-mem-data

  Print memory data annotations when printing functions

• --print-normalized

  Print functions after CFG is normalized

• --print-only=<func1,func2,func3,...>

  List of functions to print

• --print-orc

  Print ORC unwind information for instructions

• --print-profile

  Print functions after attaching profile

• --print-profile-stats

  Print profile quality/bias analysis

• --print-pseudo-probes=<value>

  Print pseudo probe info

  • decode: decode probes section from binary
  • address_conversion: update address2ProbesMap with output block address
  • encoded_probes: display the encoded probes in binary section
  • all: enable all debugging printout

• --print-relocations

  Print relocations when printing functions/objects

• --print-reordered-data

  Print section contents after reordering

• --print-retpoline-insertion

  Print functions after retpoline insertion pass

• --print-sdt

  Print all SDT markers

• --print-sections

  Print all registered sections

• --print-unknown

  Print names of functions with unknown control flow

• --time-build

  Print time spent constructing binary functions

• --time-rewrite

  Print time spent in rewriting passes

• --print-after-branch-fixup

  Print function after fixing local branches

• --print-after-jt-footprint-reduction

  Print function after jt-footprint-reduction pass

• --print-after-lowering

  Print function after instruction lowering

• --print-cache-metrics

  Calculate and print various metrics for instruction cache

• --print-clusters

  Print clusters

• --print-estimate-edge-counts

  Print function after edge counts are set for no-LBR profile

• --print-finalized

  Print function after CFG is finalized

• --print-fix-relaxations

  Print functions after fix relaxations pass

• --print-fix-riscv-calls

  Print functions after fix RISCV calls pass

• --print-fop

  Print functions after frame optimizer pass

• --print-function-statistics=<uint>

  Print statistics about basic block ordering

• --print-icf

  Print functions after ICF optimization

• --print-icp

  Print functions after indirect call promotion

• --print-inline

  Print functions after inlining optimization

• --print-large-functions

  Print functions that could not be overwritten due to excessive size

• --print-longjmp

  Print functions after longjmp pass

• --print-optimize-bodyless

  Print functions after bodyless optimization

• --print-output-address-range

  Print output address range for each basic block in the function whenBinaryFunction::print is called

• --print-peepholes

  Print functions after peephole optimization

• --print-plt

  Print functions after PLT optimization

• --print-regreassign

  Print functions after regreassign pass

• --print-reordered

  Print functions after layout optimization

• --print-reordered-functions

  Print functions after clustering

• --print-sctc

  Print functions after conditional tail call simplification

• --print-simplify-rodata-loads

  Print functions after simplification of RO data loads

• --print-sorted-by=<value>

  Print functions sorted by order of dyno stats

  • executed-forward-branches: executed forward branches
  • taken-forward-branches: taken forward branches
  • executed-backward-branches: executed backward branches
  • taken-backward-branches: taken backward branches
  • executed-unconditional-branches: executed unconditional branches
  • all-function-calls: all function calls
  • indirect-calls: indirect calls
  • PLT-calls: PLT calls
  • executed-instructions: executed instructions
  • executed-load-instructions: executed load instructions
  • executed-store-instructions: executed store instructions
  • taken-jump-table-branches: taken jump table branches
  • taken-unknown-indirect-branches: taken unknown indirect branches
  • total-branches: total branches
  • taken-branches: taken branches
  • non-taken-conditional-branches: non-taken conditional branches
  • taken-conditional-branches: taken conditional branches
  • all-conditional-branches: all conditional branches
  • linker-inserted-veneer-calls: linker-inserted veneer calls
  • all: sorted by all names

• --print-sorted-by-order=<value>

  Use ascending or descending order when printing functions ordered by dyno stats

• --print-split

  Print functions after code splitting

• --print-stoke

  Print functions after stoke analysis

• --print-uce

  Print functions after unreachable code elimination

• --print-veneer-elimination

  Print functions after veneer elimination pass

• --time-opts

  Print time spent in each optimization

• --print-all-options

  Print all option values after command line parsing

• --print-options

  Print non-default options after command line parsing