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Added support for passing an (impure) NIX_BUILD_CORES variable to build expressions.

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This patch adds the configuration file variable "build-cores" and the
command line argument "--cores". These settings specify the number of
CPU cores to utilize for parallel building within a job, i.e. by passing
an appropriate "-j" flag to GNU Make. The default value is 1, which
means that parallel building is *disabled*. If the number of build cores
is specified as 0 (synonymously: "guess" or "auto"), then the actual
value is supposed to be auto-detected by builders at run-time, i.e by
calling the nproc(1) utility from coreutils.

The environment variable $NIX_BUILD_CORES is available to builders, but
the contents of that variable does *not* influence the hash that goes
into the $out store path, i.e. the number of build cores to be utilized
can be changed at will without requiring any re-builds.
This commit is contained in:
Peter Simons 2010-06-23 14:34:08 +00:00
parent 819548d92f
commit 8b7f8b56f1
5 changed files with 35 additions and 0 deletions
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14
src/libmain/shared.cc
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@ -135,6 +135,12 @@ static void initAndRun(int argc, char * * argv)
/* Get some settings from the configuration file. */
thisSystem = querySetting("system", SYSTEM);
maxBuildJobs = queryIntSetting("build-max-jobs", 1);
string tmp = querySetting("build-cores", "/UNDEFINED");
std::transform(tmp.begin(), tmp.end(), tmp.begin(), tolower);
if (tmp == "auto" || tmp == "guess")
buildCores = 0;
else
buildCores = queryIntSetting("build-cores", 1);
maxSilentTime = queryIntSetting("build-max-silent-time", 0);
/* Catch SIGINT. */
@ -226,6 +232,14 @@ static void initAndRun(int argc, char * * argv)
tryFallback = true;
else if (arg == "--max-jobs" || arg == "-j")
maxBuildJobs = getIntArg<unsigned int>(arg, i, args.end());
else if (arg == "--cores") {
string tmp = *(++i);
std::transform(tmp.begin(), tmp.end(), tmp.begin(), tolower);
if (tmp == "auto" || tmp == "guess")
buildCores = 0u;
else
buildCores = getIntArg<unsigned int>(arg, --i, args.end());
}
else if (arg == "--readonly-mode")
readOnlyMode = true;
else if (arg == "--max-silent-time")