| commit | 2a0825d01f2cd68f5d82b3335f943bcf6f565f09 | [log] [tgz] |
|---|---|---|
| author | Jay Conrod <jayconrod@google.com> | Mon Jul 12 15:39:43 2021 -0700 |
| committer | Jay Conrod <jayconrod@google.com> | Tue Jul 20 00:06:06 2021 +0000 |
| tree | 92ea2f9453fdde34a447844eba227c2a31215a39 | |
| parent | 3e06338c5ddb6cfd639015ba24655f9c9df87ef7 [diff] |
[dev.fuzz] internal/fuzz: avoid marshaling input before calling fuzz function Previously, before each call to the fuzz function, the worker process marshalled the mutated input into shared memory. If the worker process terminates unexpectedly, it's important that the coordinator can find the crashing input in shared memory. Profiling shows this marshalling is very expensive though. This change takes another strategy. Instead of marshaling each mutated input, the worker process no longer modifies the input in shared memory at all. Instead, it saves its PRNG state in shared memory and increments a counter before each fuzz function call. If the worker process terminates, the coordinator can reconstruct the crashing value using this information. This change gives a ~10x increase in execs/s for a trivial fuzz function with -parallel=1. Change-Id: I18cf326c252727385dc53ea2518922b1f6ae36b6 Reviewed-on: https://go-review.googlesource.com/c/go/+/334149 Trust: Jay Conrod <jayconrod@google.com> Trust: Katie Hockman <katie@golang.org> Run-TryBot: Jay Conrod <jayconrod@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Katie Hockman <katie@golang.org>
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