mirror of https://git.tukaani.org/xz.git
95 lines
1.8 KiB
C
95 lines
1.8 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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/// \file hardware.c
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/// \brief Detection of available hardware resources
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//
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// Author: Lasse Collin
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//
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// This file has been put into the public domain.
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// You can do whatever you want with this file.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include "private.h"
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#include "tuklib_physmem.h"
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#include "tuklib_cpucores.h"
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/// Maximum number of free *coder* threads. This can be set with
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/// the --threads=NUM command line option.
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static uint32_t threadlimit;
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/// Memory usage limit
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static uint64_t memlimit;
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extern void
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hardware_threadlimit_set(uint32_t new_threadlimit)
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{
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if (new_threadlimit == 0) {
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// The default is the number of available CPU cores.
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threadlimit = tuklib_cpucores();
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if (threadlimit == 0)
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threadlimit = 1;
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} else {
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threadlimit = new_threadlimit;
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}
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return;
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}
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extern uint32_t
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hardware_threadlimit_get(void)
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{
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return threadlimit;
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}
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extern void
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hardware_memlimit_set(uint64_t new_memlimit)
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{
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if (new_memlimit == 0) {
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// The default is 40 % of total installed physical RAM.
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hardware_memlimit_set_percentage(40);
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} else {
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memlimit = new_memlimit;
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}
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return;
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}
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extern void
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hardware_memlimit_set_percentage(uint32_t percentage)
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{
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assert(percentage > 0);
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assert(percentage <= 100);
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uint64_t mem = tuklib_physmem();
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// If we cannot determine the amount of RAM, use the assumption
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// defined by the configure script.
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if (mem == 0)
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mem = (uint64_t)(ASSUME_RAM) * 1024 * 1024;
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memlimit = percentage * mem / 100;
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return;
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}
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extern uint64_t
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hardware_memlimit_get(void)
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{
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return memlimit;
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}
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extern void
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hardware_init(void)
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{
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hardware_memlimit_set(0);
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hardware_threadlimit_set(0);
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return;
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}
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