AuroraMiddleware/liblzma
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

xz: Add support for threaded compression.

Browse Source
This commit is contained in:
Lasse Collin 2011-04-11 22:06:03 +03:00
parent de678e0c92
commit 24e0406c0f
2 changed files with 124 additions and 79 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
src/xz/args.c
View File

@ -179,8 +179,9 @@ parse_real(args_info *args, int argc, char **argv)
break;
case 'T':
// The max is from src/liblzma/common/common.h.
hardware_threads_set(str_to_uint64("threads",
optarg, 0, LZMA_THREADS_MAX));
optarg, 0, 16384));
break;
// --version

200
src/xz/coder.c
View File

@ -55,6 +55,14 @@ static lzma_check check;
/// This becomes false if the --check=CHECK option is used.
static bool check_default = true;
#ifdef HAVE_PTHREAD
static lzma_mt mt_options = {
.flags = 0,
.timeout = 300,
.filters = filters,
};
#endif
extern void
coder_set_check(lzma_check new_check)
@ -117,6 +125,15 @@ memlimit_too_small(uint64_t memory_usage)
extern void
coder_set_compression_settings(void)
{
// The default check type is CRC64, but fallback to CRC32
// if CRC64 isn't supported by the copy of liblzma we are
// using. CRC32 is always supported.
if (check_default) {
check = LZMA_CHECK_CRC64;
if (!lzma_check_is_supported(check))
check = LZMA_CHECK_CRC32;
}
// Options for LZMA1 or LZMA2 in case we are using a preset.
static lzma_options_lzma opt_lzma;
@ -170,15 +187,26 @@ coder_set_compression_settings(void)
// Print the selected filter chain.
message_filters_show(V_DEBUG, filters);
// If using --format=raw, we can be decoding. The memusage function
// also validates the filter chain and the options used for the
// filters.
// Get the memory usage. Note that if --format=raw was used,
// we can be decompressing.
const uint64_t memory_limit = hardware_memlimit_get(opt_mode);
uint64_t memory_usage;
if (opt_mode == MODE_COMPRESS)
memory_usage = lzma_raw_encoder_memusage(filters);
else
if (opt_mode == MODE_COMPRESS) {
#ifdef HAVE_PTHREAD
if (opt_format == FORMAT_XZ && hardware_threads_get() > 1) {
mt_options.threads = hardware_threads_get();
mt_options.block_size = opt_block_size;
mt_options.check = check;
memory_usage = lzma_stream_encoder_mt_memusage(
&mt_options);
} else
#endif
{
memory_usage = lzma_raw_encoder_memusage(filters);
}
} else {
memory_usage = lzma_raw_decoder_memusage(filters);
}
if (memory_usage == UINT64_MAX)
message_fatal(_("Unsupported filter chain or filter options"));
@ -194,90 +222,99 @@ coder_set_compression_settings(void)
round_up_to_mib(decmem), 0));
}
if (memory_usage > memory_limit) {
// If --no-auto-adjust was used or we didn't find LZMA1 or
// LZMA2 as the last filter, give an error immediately.
// --format=raw implies --no-auto-adjust.
if (!opt_auto_adjust || opt_format == FORMAT_RAW)
memlimit_too_small(memory_usage);
if (memory_usage <= memory_limit)
return;
assert(opt_mode == MODE_COMPRESS);
// If --no-auto-adjust was used or we didn't find LZMA1 or
// LZMA2 as the last filter, give an error immediately.
// --format=raw implies --no-auto-adjust.
if (!opt_auto_adjust || opt_format == FORMAT_RAW)
memlimit_too_small(memory_usage);
// Look for the last filter if it is LZMA2 or LZMA1, so
// we can make it use less RAM. With other filters we don't
// know what to do.
size_t i = 0;
while (filters[i].id != LZMA_FILTER_LZMA2
&& filters[i].id != LZMA_FILTER_LZMA1) {
if (filters[i].id == LZMA_VLI_UNKNOWN)
assert(opt_mode == MODE_COMPRESS);
#ifdef HAVE_PTHREAD
if (opt_format == FORMAT_XZ && mt_options.threads > 1) {
// Try to reduce the number of threads before
// adjusting the compression settings down.
do {
// FIXME? The real single-threaded mode has
// lower memory usage, but it's not comparable
// because it doesn't write the size info
// into Block Headers.
if (--mt_options.threads == 0)
memlimit_too_small(memory_usage);
++i;
}
// Decrease the dictionary size until we meet the memory
// usage limit. First round down to full mebibytes.
lzma_options_lzma *opt = filters[i].options;
const uint32_t orig_dict_size = opt->dict_size;
opt->dict_size &= ~((UINT32_C(1) << 20) - 1);
while (true) {
// If it is below 1 MiB, auto-adjusting failed. We
// could be more sophisticated and scale it down even
// more, but let's see if many complain about this
// version.
//
// FIXME: Displays the scaled memory usage instead
// of the original.
if (opt->dict_size < (UINT32_C(1) << 20))
memlimit_too_small(memory_usage);
memory_usage = lzma_raw_encoder_memusage(filters);
memory_usage = lzma_stream_encoder_mt_memusage(
&mt_options);
if (memory_usage == UINT64_MAX)
message_bug();
// Accept it if it is low enough.
if (memory_usage <= memory_limit)
break;
} while (memory_usage > memory_limit);
// Otherwise 1 MiB down and try again. I hope this
// isn't too slow method for cases where the original
// dict_size is very big.
opt->dict_size -= UINT32_C(1) << 20;
}
message(V_WARNING, _("Adjusted the number of threads "
"from %s to %s to not exceed "
"the memory usage limit of %s MiB"),
uint64_to_str(hardware_threads_get(), 0),
uint64_to_str(mt_options.threads, 1),
uint64_to_str(round_up_to_mib(
memory_limit), 2));
}
#endif
// Tell the user that we decreased the dictionary size.
message(V_WARNING, _("Adjusted LZMA%c dictionary size "
"from %s MiB to %s MiB to not exceed "
"the memory usage limit of %s MiB"),
filters[i].id == LZMA_FILTER_LZMA2
? '2' : '1',
uint64_to_str(orig_dict_size >> 20, 0),
uint64_to_str(opt->dict_size >> 20, 1),
uint64_to_str(round_up_to_mib(
memory_limit), 2));
if (memory_usage <= memory_limit)
return;
// Look for the last filter if it is LZMA2 or LZMA1, so we can make
// it use less RAM. With other filters we don't know what to do.
size_t i = 0;
while (filters[i].id != LZMA_FILTER_LZMA2
&& filters[i].id != LZMA_FILTER_LZMA1) {
if (filters[i].id == LZMA_VLI_UNKNOWN)
memlimit_too_small(memory_usage);
++i;
}
/*
// Limit the number of worker threads so that memory usage
// limit isn't exceeded.
assert(memory_usage > 0);
size_t thread_limit = memory_limit / memory_usage;
if (thread_limit == 0)
thread_limit = 1;
// Decrease the dictionary size until we meet the memory
// usage limit. First round down to full mebibytes.
lzma_options_lzma *opt = filters[i].options;
const uint32_t orig_dict_size = opt->dict_size;
opt->dict_size &= ~((UINT32_C(1) << 20) - 1);
while (true) {
// If it is below 1 MiB, auto-adjusting failed. We could be
// more sophisticated and scale it down even more, but let's
// see if many complain about this version.
//
// FIXME: Displays the scaled memory usage instead
// of the original.
if (opt->dict_size < (UINT32_C(1) << 20))
memlimit_too_small(memory_usage);
if (opt_threads > thread_limit)
opt_threads = thread_limit;
*/
memory_usage = lzma_raw_encoder_memusage(filters);
if (memory_usage == UINT64_MAX)
message_bug();
if (check_default) {
// The default check type is CRC64, but fallback to CRC32
// if CRC64 isn't supported by the copy of liblzma we are
// using. CRC32 is always supported.
check = LZMA_CHECK_CRC64;
if (!lzma_check_is_supported(check))
check = LZMA_CHECK_CRC32;
// Accept it if it is low enough.
if (memory_usage <= memory_limit)
break;
// Otherwise 1 MiB down and try again. I hope this
// isn't too slow method for cases where the original
// dict_size is very big.
opt->dict_size -= UINT32_C(1) << 20;
}
// Tell the user that we decreased the dictionary size.
message(V_WARNING, _("Adjusted LZMA%c dictionary size "
"from %s MiB to %s MiB to not exceed "
"the memory usage limit of %s MiB"),
filters[i].id == LZMA_FILTER_LZMA2
? '2' : '1',
uint64_to_str(orig_dict_size >> 20, 0),
uint64_to_str(opt->dict_size >> 20, 1),
uint64_to_str(round_up_to_mib(memory_limit), 2));
return;
}
@ -356,7 +393,14 @@ coder_init(file_pair *pair)
break;
case FORMAT_XZ:
ret = lzma_stream_encoder(&strm, filters, check);
#ifdef HAVE_PTHREAD
if (hardware_threads_get() > 1)
ret = lzma_stream_encoder_mt(
&strm, &mt_options);
else
#endif
ret = lzma_stream_encoder(
&strm, filters, check);
break;
case FORMAT_LZMA:
@ -477,8 +521,8 @@ coder_normal(file_pair *pair)
// to the .xz format. If block_remaining == UINT64_MAX, only
// a single block is created.
uint64_t block_remaining = UINT64_MAX;
if (opt_mode == MODE_COMPRESS && opt_format == FORMAT_XZ
&& opt_block_size > 0)
if (hardware_threads_get() == 1 && opt_mode == MODE_COMPRESS
&& opt_format == FORMAT_XZ && opt_block_size > 0)
block_remaining = opt_block_size;
strm.next_out = out_buf.u8;