mirror of
https://git.tukaani.org/xz.git
synced 2024-04-04 12:36:23 +02:00
1880a3927b
lzma, unlzma, and lzcat in "make install" for backwards compatibility with LZMA Utils 4.32.x; I'm not sure if this should be the default though.
122 lines
3.1 KiB
C
122 lines
3.1 KiB
C
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
/// \file hardware.c
|
|
/// \brief Detection of available hardware resources
|
|
//
|
|
// Copyright (C) 2007 Lasse Collin
|
|
//
|
|
// This program is free software; you can redistribute it and/or
|
|
// modify it under the terms of the GNU Lesser General Public
|
|
// License as published by the Free Software Foundation; either
|
|
// version 2.1 of the License, or (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
// Lesser General Public License for more details.
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include "private.h"
|
|
#include "physmem.h"
|
|
|
|
|
|
/// Maximum number of free *coder* threads. This can be set with
|
|
/// the --threads=NUM command line option.
|
|
size_t opt_threads = 1;
|
|
|
|
|
|
/// Memory usage limit for encoding
|
|
static uint64_t memlimit_encoder;
|
|
|
|
/// Memory usage limit for decoding
|
|
static uint64_t memlimit_decoder;
|
|
|
|
/// Memory usage limit given on the command line or environment variable.
|
|
/// Zero indicates the default (memlimit_encoder or memlimit_decoder).
|
|
static uint64_t memlimit_custom = 0;
|
|
|
|
|
|
/// Get the number of CPU cores, and set opt_threads to default to that value.
|
|
/// User can then override this with --threads command line option.
|
|
static void
|
|
hardware_cores(void)
|
|
{
|
|
#if defined(HAVE_NUM_PROCESSORS_SYSCONF)
|
|
const long cpus = sysconf(_SC_NPROCESSORS_ONLN);
|
|
if (cpus > 0)
|
|
opt_threads = (size_t)(cpus);
|
|
|
|
#elif defined(HAVE_NUM_PROCESSORS_SYSCTL)
|
|
int name[2] = { CTL_HW, HW_NCPU };
|
|
int cpus;
|
|
size_t cpus_size = sizeof(cpus);
|
|
if (!sysctl(name, &cpus, &cpus_size, NULL, NULL)
|
|
&& cpus_size == sizeof(cpus) && cpus > 0)
|
|
opt_threads = (size_t)(cpus);
|
|
#endif
|
|
|
|
// Limit opt_threads so that maximum number of threads doesn't exceed.
|
|
|
|
#if defined(_SC_THREAD_THREADS_MAX)
|
|
const long threads_max = sysconf(_SC_THREAD_THREADS_MAX);
|
|
if (threads_max > 0 && (size_t)(threads_max) < opt_threads)
|
|
opt_threads = (size_t)(threads_max);
|
|
|
|
#elif defined(PTHREAD_THREADS_MAX)
|
|
if (opt_threads > PTHREAD_THREADS_MAX)
|
|
opt_threads = PTHREAD_THREADS_MAX;
|
|
#endif
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
static void
|
|
hardware_memlimit_init(void)
|
|
{
|
|
uint64_t mem = physmem();
|
|
|
|
// If we cannot determine the amount of RAM, assume 32 MiB. Maybe
|
|
// even that is too much on some systems. But on most systems it's
|
|
// far too little, and can be annoying.
|
|
if (mem == 0)
|
|
mem = UINT64_C(16) * 1024 * 1024;
|
|
|
|
// Use at maximum of 90 % of RAM when encoding and 33 % when decoding.
|
|
memlimit_encoder = mem - mem / 10;
|
|
memlimit_decoder = mem / 3;
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
extern void
|
|
hardware_memlimit_set(uint64_t memlimit)
|
|
{
|
|
memlimit_custom = memlimit;
|
|
return;
|
|
}
|
|
|
|
|
|
extern uint64_t
|
|
hardware_memlimit_encoder(void)
|
|
{
|
|
return memlimit_custom != 0 ? memlimit_custom : memlimit_encoder;
|
|
}
|
|
|
|
|
|
extern uint64_t
|
|
hardware_memlimit_decoder(void)
|
|
{
|
|
return memlimit_custom != 0 ? memlimit_custom : memlimit_decoder;
|
|
}
|
|
|
|
|
|
extern void
|
|
hardware_init(void)
|
|
{
|
|
hardware_memlimit_init();
|
|
hardware_cores();
|
|
return;
|
|
}
|