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Merge pull request #1857 from dtzWill/fix/check-for-lzma-mt

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configure.ac: check if lzma has MT support, fix deb build/etc.
This commit is contained in:
Eelco Dolstra 2018-02-19 13:06:14 +01:00 committed by GitHub
commit 7fe5910bf8
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2 changed files with 39 additions and 23 deletions
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2
configure.ac
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@ -175,6 +175,8 @@ AC_SUBST(HAVE_SODIUM, [$have_sodium])
# Look for liblzma, a required dependency.
PKG_CHECK_MODULES([LIBLZMA], [liblzma], [CXXFLAGS="$LIBLZMA_CFLAGS $CXXFLAGS"])
AC_CHECK_LIB([lzma], [lzma_stream_encoder_mt],
[AC_DEFINE([HAVE_LZMA_MT], [1], [xz multithreaded compression support])])
# Look for libbrotli{enc,dec}, optional dependencies

60
src/libutil/compression.cc
View File

@ -1,6 +1,7 @@
#include "compression.hh"
#include "util.hh"
#include "finally.hh"
#include "logging.hh"
#include <lzma.h>
#include <bzlib.h>
@ -189,28 +190,9 @@ struct XzSink : CompressionSink
lzma_stream strm = LZMA_STREAM_INIT;
bool finished = false;
XzSink(Sink & nextSink, const bool parallel) : nextSink(nextSink)
{
lzma_ret ret;
if (parallel) {
lzma_mt mt_options = {};
mt_options.flags = 0;
mt_options.timeout = 300; // Using the same setting as the xz cmd line
mt_options.preset = LZMA_PRESET_DEFAULT;
mt_options.filters = NULL;
mt_options.check = LZMA_CHECK_CRC64;
mt_options.threads = lzma_cputhreads();
mt_options.block_size = 0;
if (mt_options.threads == 0)
mt_options.threads = 1;
// FIXME: maybe use lzma_stream_encoder_mt_memusage() to control the
// number of threads.
ret = lzma_stream_encoder_mt(
&strm, &mt_options);
} else
ret = lzma_easy_encoder(
&strm, 6, LZMA_CHECK_CRC64);
template <typename F>
XzSink(Sink & nextSink, F&& initEncoder) : nextSink(nextSink) {
lzma_ret ret = initEncoder();
if (ret != LZMA_OK)
throw CompressionError("unable to initialise lzma encoder");
// FIXME: apply the x86 BCJ filter?
@ -218,6 +200,9 @@ struct XzSink : CompressionSink
strm.next_out = outbuf;
strm.avail_out = sizeof(outbuf);
}
XzSink(Sink & nextSink) : XzSink(nextSink, [this]() {
return lzma_easy_encoder(&strm, 6, LZMA_CHECK_CRC64);
}) {}
~XzSink()
{
@ -271,6 +256,27 @@ struct XzSink : CompressionSink
}
};
#ifdef HAVE_LZMA_MT
struct ParallelXzSink : public XzSink
{
ParallelXzSink(Sink &nextSink) : XzSink(nextSink, [this]() {
lzma_mt mt_options = {};
mt_options.flags = 0;
mt_options.timeout = 300; // Using the same setting as the xz cmd line
mt_options.preset = LZMA_PRESET_DEFAULT;
mt_options.filters = NULL;
mt_options.check = LZMA_CHECK_CRC64;
mt_options.threads = lzma_cputhreads();
mt_options.block_size = 0;
if (mt_options.threads == 0)
mt_options.threads = 1;
// FIXME: maybe use lzma_stream_encoder_mt_memusage() to control the
// number of threads.
return lzma_stream_encoder_mt(&strm, &mt_options);
}) {}
};
#endif
struct BzipSink : CompressionSink
{
Sink & nextSink;
@ -469,10 +475,18 @@ struct BrotliSink : CompressionSink
ref<CompressionSink> makeCompressionSink(const std::string & method, Sink & nextSink, const bool parallel)
{
if (parallel) {
#ifdef HAVE_LZMA_MT
if (method == "xz")
return make_ref<ParallelXzSink>(nextSink);
#endif
printMsg(lvlError, format("Warning: parallel compression requested but not supported for method '%1%', falling back to single-threaded compression") % method);
}
if (method == "none")
return make_ref<NoneSink>(nextSink);
else if (method == "xz")
return make_ref<XzSink>(nextSink, parallel);
return make_ref<XzSink>(nextSink);
else if (method == "bzip2")
return make_ref<BzipSink>(nextSink);
else if (method == "br")