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Unified Diff: xz/src/xz/hardware.c

Issue 2869016: Add an unpatched version of xz, XZ Utils, to /trunk/deps/third_party (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/deps/third_party/
Patch Set: Created 10 years, 6 months ago
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Index: xz/src/xz/hardware.c
===================================================================
--- xz/src/xz/hardware.c (revision 0)
+++ xz/src/xz/hardware.c (revision 0)
@@ -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;
+}
Property changes on: xz/src/xz/hardware.c
___________________________________________________________________
Added: svn:eol-style
+ LF
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