> To be backward compatible, maybe it needs extra syntax within the
> --threads option or a new command line option. Both are a bit annoying
> and ugly but I don't have a better idea.
I added a flag to the threading option to force multithreading or
single threading modes. Right now, if the user specifies -T s4, xz
will ignore the 4 threads requested and do single threaded mode.
Should I issue a warning message, cause an error, or is this the
preferred behavior?
> common.h is internal to liblzma and must not be used from xz. Maybe
> LZMA_THREADS_MAX could be moved to the public API, I don't know right
> now.
I put the hardcoded value back.
---
src/xz/args.c | 38 +++---
src/xz/coder.c | 16 +---
src/xz/coder.h | 3 +++
src/xz/message.c | 7 +--
4 files changed, 56 insertions(+), 8 deletions(-)
diff --git a/src/xz/args.c b/src/xz/args.c
index 9238fb3..2fe98cd 100644
--- a/src/xz/args.c
+++ b/src/xz/args.c
@@ -115,6 +115,40 @@ parse_block_list(char *str)
return;
}
+static void
+parse_threading(char* optarg){
+ char multithreaded_mode = optarg[0];
+ bool threading_specified = false;
+
+ if(multithreaded_mode == 'm' || multithreaded_mode == 's'){
+ threading_specified = true;
+ optarg++;
+ }
+
+ // The max is from src/liblzma/common/common.h.
+ uint64_t threads_requested = str_to_uint64("threads",
+ optarg, 0, 16384);
+ hardware_threads_set(threads_requested);
+
+ if(threading_specified){
+ if(multithreaded_mode == 'm'){
+ set_multithreaded_mode(true);
+ }
+ else if(multithreaded_mode == 's') {
+ set_multithreaded_mode(false);
+ }
+ }
+ else {
+ //Default for --threads=1 is single threaded mode
+ if(threads_requested == 1){
+ set_multithreaded_mode(false);
+ }
+ //Default for --threads=0 or --threads=[n>1] is multi threaded mode
+ else {
+ set_multithreaded_mode(true);
+ }
+ }
+}
static void
parse_real(args_info *args, int argc, char **argv)
@@ -247,9 +281,7 @@ 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, 16384));
+ parse_threading(optarg);
break;
// --version
diff --git a/src/xz/coder.c b/src/xz/coder.c
index 85f9543..8dfdeb2 100644
--- a/src/xz/coder.c
+++ b/src/xz/coder.c
@@ -51,6 +51,9 @@ static lzma_check check;
/// This becomes false if the --check=CHECK option is used.
static bool check_default = true;
+/// Flag to indicate multithreaded compression
+static bool multithreaded_mode = false;
+
#if defined(HAVE_ENCODERS) && defined(MYTHREAD_ENABLED)
static lzma_mt mt_options = {
.flags = 0,
@@ -211,10 +214,11 @@ coder_set_compression_settings(void)
}
}
- if (hardware_threads_get() > 1) {
+ if (multithreaded_mode) {
message(V_WARNING, _("Switching to single-threaded "
"mode due to --flush-timeout"));
hardware_threads_set(1);
+ set_multithreaded_mode(false);
}
}
@@ -225,7 +229,7 @@ coder_set_compression_settings(void)
if (opt_mode == MODE_COMPRESS) {
#ifdef HAVE_ENCODERS
# ifdef MYTHREAD_ENABLED
- if (opt_format == FORMAT_XZ && hardware_threads_get() > 1) {
+ if (opt_format == FORMAT_XZ && (hardware_threads_get() > 1 ||
multithreaded_mode)) {
mt_options.threads = hardware_threads_get();
mt_options.block_size = opt_block_size;
mt_options.check = check;
@@ -446,7 +450,7 @@ coder_init(file_pair *pair)
case FORMAT_XZ:
# ifdef MYTHREAD_ENABLED
- if (hardware_threads_get() > 1)
+ if (multithreaded_mode)
ret = lzma_stream_encoder_mt(
&strm, &mt_options);
else
@@ -933,6 +937,12 @@ coder_run(const char *filename)
return;
}
+extern void
+set_multithreaded_mode(bool mode)
+{
+ multithreaded_mode = mode;
+}
+
#ifndef NDEBUG
extern void
diff --git a/src/xz/coder.h b/src/xz/coder.h
index 583da8f..178f036 100644
--- a/src/xz/coder.h
+++ b/src/xz/coder.h
@@ -70,6 +70,9 @@ extern void coder_set_compression_settings(void);
/// Compress or decompress the given file
extern void coder_run(const char *filename);
+ Set multithread mode true/false
+extern void set_multithreaded_mode(bool mode);
+
#ifndef NDEBUG
/// Free the memory allocated for the coder and kill the worker threads.
extern void coder_free(void);
diff --git a/src/xz/message.c b/src/xz/message.c
index 00eb65b..ceb1cdd 100644
--- a/src/xz/message.c
+++ b/src/xz/message.c
@@ -1159,8 +1159,11 @@ message_help(bool long_help)
" does not affect decompressor memory requirements"));
puts(_(
-" -T, --threads=NUM use at most NUM threads; the default is 1; set to 0\n"
-" to use as many threads as there are processor cores"));
+" -T[m|s],\n"
+" --threads[m|s]=NUM use at most NUM threads; the default is 1; set to 0\n"
+" to use as many threads as there are processor cores\n"
+" if s is set, force single threaded mode; if m i set,\n"
+" force multithreaded mode"));
if (long_help) {
puts(_(
--
2.25.1
From f855507add2f7d2e1822584f76c7ad56fe7d249d Mon Sep 17 00:00:00 2001
From: jiat75
Date: Tue, 30 Nov 2021 22:07:46 +0800
Subject: [PATCH] Multithreaded mode now always uses stream_encoder_mt
---
s
