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Tune compression:

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bzip2: block size 9 -> 5, reduces memory by 400Kbytes, doesn't affect speed
       or compression ratio on all but the largest bytecode files (>1MB)
zip:   level 9 -> 6, this speeds up compression time by ~30% but only
       degrades the compressed size by a few bytes per megabyte. Those few
       bytes aren't worth the effort.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17647 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2004-11-09 17:58:09 +00:00
parent a8e475093a
commit 580a1164d8
1 changed files with 2 additions and 2 deletions
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4
lib/Support/Compressor.cpp
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@ -136,7 +136,7 @@ uint64_t Compressor::compress(char* in, unsigned size, OutputDataCallback* cb,
bzdata.avail_in = size;
bzdata.next_out = 0;
bzdata.avail_out = 0;
switch ( BZ2_bzCompressInit(&bzdata, 9, 0, 100) ) {
switch ( BZ2_bzCompressInit(&bzdata, 5, 0, 100) ) {
case BZ_CONFIG_ERROR: throw std::string("bzip2 library mis-compiled");
case BZ_PARAM_ERROR: throw std::string("Compressor internal error");
case BZ_MEM_ERROR: throw std::string("Out of memory");
@ -190,7 +190,7 @@ uint64_t Compressor::compress(char* in, unsigned size, OutputDataCallback* cb,
zdata.opaque = Z_NULL;
zdata.next_in = reinterpret_cast<Bytef*>(in);
zdata.avail_in = size;
if (Z_OK != deflateInit(&zdata,Z_BEST_COMPRESSION))
if (Z_OK != deflateInit(&zdata,6))
throw std::string(zdata.msg ? zdata.msg : "zlib error");
if (0 != getdata((char*&)(zdata.next_out), zdata.avail_out,cb,context)) {