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| author | van Hauser <vh@thc.org> | 2019-10-23 17:01:05 +0200 |
|---|---|---|
| committer | van Hauser <vh@thc.org> | 2019-10-23 17:01:05 +0200 |
| commit | 39b7f488705a7e242b7a54695ca8e03fb2e73d81 (patch) | |
| tree | 16eb0d16c070601b52777565a200978b333017f1 | |
| parent | b9bc81544a438868529fbe040f4734256dce7a1d (diff) | |
| download | afl++-39b7f488705a7e242b7a54695ca8e03fb2e73d81.tar.gz | |
performance doc enhancements
| -rw-r--r-- | docs/perf_tips.txt | 8 | ||||
| -rwxr-xr-x | test/test-performance.sh | 7 | ||||
| -rwxr-xr-x | test/test.sh | 1 |
3 files changed, 15 insertions, 1 deletions
diff --git a/docs/perf_tips.txt b/docs/perf_tips.txt index 215895b6..2fa19234 100644 --- a/docs/perf_tips.txt +++ b/docs/perf_tips.txt @@ -50,6 +50,9 @@ Even if you don't have a lightweight harness for a particular target, remember that you can always use another, related library to generate a corpus that will be then manually fed to a more resource-hungry program later on. +Also note that reading the fuzzing input via stdin is faster than reading from +a file. + 3) Use LLVM instrumentation --------------------------- @@ -161,6 +164,11 @@ and not waste CPU time. There are several OS-level factors that may affect fuzzing speed: + - If you have no risk of power loss then run your fuzzing on a tmpfs + partition. This increases the performance noticably. + Alternatively you can use AFL_TMPDIR to point to a tmpfs location to + just write the input file to a tmpfs. + - High system load. Use idle machines where possible. Kill any non-essential CPU hogs (idle browser windows, media players, complex screensavers, etc). diff --git a/test/test-performance.sh b/test/test-performance.sh index 198b58c4..87eea665 100755 --- a/test/test-performance.sh +++ b/test/test-performance.sh @@ -1,6 +1,10 @@ #!/bin/bash -FILE=~/.afl_performance +# if you want a specific performance file (e.g. to compare features to another) +# you can set the AFL_PERFORMANCE_FILE environment variable: +FILE=$AFL_PERFORMANCE_FILE +# otherwise we use ~/.afl_performance +test -z "$FILE" && FILE=~/.afl_performance test -e $FILE || { echo Warning: This script measure the performance of afl++ and saves the result for future comparisons into $FILE @@ -17,6 +21,7 @@ unset AFL_USE_ASAN unset AFL_USE_MSAN unset AFL_CC unset AFL_PRELOAD +unset AFL_GCC_WHITELIST unset AFL_LLVM_WHITELIST unset AFL_LLVM_INSTRIM unset AFL_LLVM_LAF_SPLIT_SWITCHES diff --git a/test/test.sh b/test/test.sh index 598fb502..da0590ef 100755 --- a/test/test.sh +++ b/test/test.sh @@ -33,6 +33,7 @@ unset AFL_USE_ASAN unset AFL_USE_MSAN unset AFL_CC unset AFL_PRELOAD +unset AFL_GCC_WHITELIST unset AFL_LLVM_WHITELIST unset AFL_LLVM_INSTRIM unset AFL_LLVM_LAF_SPLIT_SWITCHES |