c/self-test/diskcheck: Avoid large allocations #11173
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`diskcheck_opts::request_size` is provided by the user. To avoid very large allocations, split the request size into at most 128KiB chunks, and read/write them via an iovec. Preliminary testing shows very little difference in the performance. Fixes redpanda-data#10305 Signed-off-by: Ben Pope <ben@redpanda.com>
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dotnwat
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Jun 2, 2023
| iov.reserve(_opts.request_size / buf_len); | ||
| for (size_t offset = 0; offset < _opts.request_size; offset += buf_len) { | ||
| size_t len = std::min(_opts.request_size - offset, buf_len); | ||
| iov.push_back(iovec{buf.get(), len}); |
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should we regenerate with new random data here? potentially to avoid making compression more effective?
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There's no compression option in self_test::diskcheck , so i think its cool
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ping @graphcareful |
graphcareful
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Jun 4, 2023
| iov.reserve(_opts.request_size / buf_len); | ||
| for (size_t offset = 0; offset < _opts.request_size; offset += buf_len) { | ||
| size_t len = std::min(_opts.request_size - offset, buf_len); | ||
| iov.push_back(iovec{buf.get(), len}); |
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There's no compression option in self_test::diskcheck , so i think its cool
dotnwat
approved these changes
Jun 5, 2023
|
/backport v23.1.x |
This was referenced Jun 5, 2023
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Thanks for this fix, @BenPope! |
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diskcheck_opts::request_sizeis provided by the user.To avoid very large allocations, split the request size into at most 128KiB chunks, and read/write them via an iovec.
Local testing with a single core:
Fixes #10305
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