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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 "physmem.h"
#include "cpucores.h"
/// Maximum number of free *coder* threads. This can be set with
/// the --threads=NUM command line option.
static uint32_t threads_max;
/// 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_threadlimit_init(void)
{
threads_max = cpucores();
if (threads_max == 0)
threads_max = 1;
return;
}
extern void
hardware_threadlimit_set(uint32_t threadlimit)
{
threads_max = threadlimit;
return;
}
extern uint32_t
hardware_threadlimit_get(void)
{
return threads_max;
}
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(32) * 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_threadlimit_init();
return;
}
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