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Diffstat (limited to 'Build/source/extra/xz-4.999.9beta-124-gb637/src/xz/hardware.c')
-rw-r--r-- | Build/source/extra/xz-4.999.9beta-124-gb637/src/xz/hardware.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/Build/source/extra/xz-4.999.9beta-124-gb637/src/xz/hardware.c b/Build/source/extra/xz-4.999.9beta-124-gb637/src/xz/hardware.c new file mode 100644 index 00000000000..74742fcec87 --- /dev/null +++ b/Build/source/extra/xz-4.999.9beta-124-gb637/src/xz/hardware.c @@ -0,0 +1,112 @@ +/////////////////////////////////////////////////////////////////////////////// +// +/// \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; +} |