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///////////////////////////////////////////////////////////////////////////////
//
/// \file hardware.c
/// \brief Detection of available hardware resources
//
// Author: Lasse Collin
//
// This file has been put into the public domain.
// You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////
#include "private.h"
#include "tuklib_cpucores.h"
/// Maximum number of free *coder* threads. This can be set with
/// the --threads=NUM command line option.
static uint32_t threadlimit;
/// Memory usage limit
static uint64_t memlimit;
/// Total amount of physical RAM
static uint64_t total_ram;
extern void
hardware_threadlimit_set(uint32_t new_threadlimit)
{
if (new_threadlimit == 0) {
// The default is the number of available CPU cores.
threadlimit = tuklib_cpucores();
if (threadlimit == 0)
threadlimit = 1;
} else {
threadlimit = new_threadlimit;
}
return;
}
extern uint32_t
hardware_threadlimit_get(void)
{
return threadlimit;
}
extern void
hardware_memlimit_set(uint64_t new_memlimit)
{
if (new_memlimit != 0) {
memlimit = new_memlimit;
} else {
// The default depends on the amount of RAM but so that
// on "low-memory" systems the relative limit is higher
// to make it more likely that files created with "xz -9"
// will still decompress without overriding the limit
// manually.
//
// If 40 % of RAM is 80 MiB or more, use 40 % of RAM as
// the limit.
memlimit = 40 * total_ram / 100;
if (memlimit < UINT64_C(80) * 1024 * 1024) {
// If 80 % of RAM is less than 80 MiB,
// use 80 % of RAM as the limit.
memlimit = 80 * total_ram / 100;
if (memlimit > UINT64_C(80) * 1024 * 1024) {
// Otherwise use 80 MiB as the limit.
memlimit = UINT64_C(80) * 1024 * 1024;
}
}
}
return;
}
extern void
hardware_memlimit_set_percentage(uint32_t percentage)
{
assert(percentage > 0);
assert(percentage <= 100);
memlimit = percentage * total_ram / 100;
return;
}
extern uint64_t
hardware_memlimit_get(void)
{
return memlimit;
}
extern void
hardware_init(void)
{
// Get the amount of RAM. If we cannot determine it,
// use the assumption defined by the configure script.
total_ram = lzma_physmem();
if (total_ram == 0)
total_ram = (uint64_t)(ASSUME_RAM) * 1024 * 1024;
// Set the defaults.
hardware_memlimit_set(0);
hardware_threadlimit_set(0);
return;
}
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