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support multi threaded xz encoder, this might be particularly useful in

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the case of hydra where the overhead of single threaded encoding is more
noticeable e.g most of the time spent in "Sending inputs"/"Receiving outputs"
is due to compression while the actual upload to the binary cache seems
to be negligible.
This commit is contained in:
AmineChikhaoui 2018-02-06 22:42:02 +01:00
parent 6f6bfc8205
commit bc7e3a4dd6
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1 changed files with 7 additions and 2 deletions
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9
src/libutil/compression.cc
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@ -191,8 +191,13 @@ struct XzSink : CompressionSink
XzSink(Sink & nextSink) : nextSink(nextSink)
{
lzma_ret ret = lzma_easy_encoder(
&strm, 6, LZMA_CHECK_CRC64);
lzma_mt mt_options = {};
mt_options.flags = 0;
mt_options.timeout = 300;
mt_options.check = LZMA_CHECK_CRC64;
mt_options.threads = lzma_cputhreads();
lzma_ret ret = lzma_stream_encoder_mt(
&strm, &mt_options);
if (ret != LZMA_OK)
throw CompressionError("unable to initialise lzma encoder");
// FIXME: apply the x86 BCJ filter?