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150 lines
3.9 KiB
C
150 lines
3.9 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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/// Maximum number of worker threads. This can be set with
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/// the --threads=NUM command line option.
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static uint32_t threads_max = 1;
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/// Memory usage limit for compression
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static uint64_t memlimit_compress;
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/// Memory usage limit for decompression
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static uint64_t memlimit_decompress;
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/// Total amount of physical RAM
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static uint64_t total_ram;
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extern void
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hardware_threads_set(uint32_t n)
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{
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if (n == 0) {
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// Automatic number of threads was requested.
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// If threading support was enabled at build time,
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// use the number of available CPU cores. Otherwise
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// use one thread since disabling threading support
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// omits lzma_cputhreads() from liblzma.
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#ifdef MYTHREAD_ENABLED
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threads_max = lzma_cputhreads();
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if (threads_max == 0)
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threads_max = 1;
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#else
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threads_max = 1;
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#endif
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} else {
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threads_max = n;
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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_threads_get(void)
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{
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return threads_max;
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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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bool set_compress, bool set_decompress, bool is_percentage)
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{
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if (is_percentage) {
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assert(new_memlimit > 0);
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assert(new_memlimit <= 100);
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new_memlimit = (uint32_t)new_memlimit * total_ram / 100;
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}
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if (set_compress)
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memlimit_compress = new_memlimit;
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if (set_decompress)
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memlimit_decompress = new_memlimit;
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return;
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}
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extern uint64_t
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hardware_memlimit_get(enum operation_mode mode)
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{
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// Zero is a special value that indicates the default. Currently
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// the default simply disables the limit. Once there is threading
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// support, this might be a little more complex, because there will
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// probably be a special case where a user asks for "optimal" number
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// of threads instead of a specific number (this might even become
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// the default mode). Each thread may use a significant amount of
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// memory. When there are no memory usage limits set, we need some
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// default soft limit for calculating the "optimal" number of
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// threads.
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const uint64_t memlimit = mode == MODE_COMPRESS
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? memlimit_compress : memlimit_decompress;
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return memlimit != 0 ? memlimit : UINT64_MAX;
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}
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/// Helper for hardware_memlimit_show() to print one human-readable info line.
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static void
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memlimit_show(const char *str, uint64_t value)
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{
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// The memory usage limit is considered to be disabled if value
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// is 0 or UINT64_MAX. This might get a bit more complex once there
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// is threading support. See the comment in hardware_memlimit_get().
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if (value == 0 || value == UINT64_MAX)
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printf("%s %s\n", str, _("Disabled"));
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else
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printf("%s %s MiB (%s B)\n", str,
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uint64_to_str(round_up_to_mib(value), 0),
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uint64_to_str(value, 1));
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return;
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}
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extern void
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hardware_memlimit_show(void)
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{
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if (opt_robot) {
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printf("%" PRIu64 "\t%" PRIu64 "\t%" PRIu64 "\n", total_ram,
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memlimit_compress, memlimit_decompress);
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} else {
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// TRANSLATORS: Test with "xz --info-memory" to see if
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// the alignment looks nice.
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memlimit_show(_("Total amount of physical memory (RAM): "),
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total_ram);
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memlimit_show(_("Memory usage limit for compression: "),
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memlimit_compress);
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memlimit_show(_("Memory usage limit for decompression: "),
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memlimit_decompress);
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}
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tuklib_exit(E_SUCCESS, E_ERROR, message_verbosity_get() != V_SILENT);
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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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// Get the amount of RAM. If we cannot determine it,
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// use the assumption defined by the configure script.
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total_ram = lzma_physmem();
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if (total_ram == 0)
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total_ram = (uint64_t)(ASSUME_RAM) * 1024 * 1024;
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// Set the defaults.
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hardware_memlimit_set(0, true, true, false);
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return;
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}
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