diff options
Diffstat (limited to 'src/libstore')
| -rw-r--r-- | src/libstore/build.cc | 3 | ||||
| -rw-r--r-- | src/libstore/globals.cc | 1 | ||||
| -rw-r--r-- | src/libstore/globals.hh | 5 |
3 files changed, 9 insertions, 0 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc index f901c1f7d99e..a53c23bf447d 100644 --- a/src/libstore/build.cc +++ b/src/libstore/build.cc @@ -1411,6 +1411,9 @@ void DerivationGoal::startBuilder() in the store or in the build directory). */ env["NIX_STORE"] = nixStore; + /* The maximum number of cores to utilize for parallel building. */ + env["NIX_BUILD_CORES"] = (format("%d") % buildCores).str(); + /* Add all bindings specified in the derivation. */ foreach (StringPairs::iterator, i, drv.env) env[i->first] = i->second; diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc index cc0e44e8e34e..75d2f69c2b72 100644 --- a/src/libstore/globals.cc +++ b/src/libstore/globals.cc @@ -22,6 +22,7 @@ bool keepGoing = false; bool tryFallback = false; Verbosity buildVerbosity = lvlInfo; unsigned int maxBuildJobs = 1; +unsigned int buildCores = 1; bool readOnlyMode = false; string thisSystem = "unset"; time_t maxSilentTime = 0; diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh index d3388e309c1b..a74a741d677e 100644 --- a/src/libstore/globals.hh +++ b/src/libstore/globals.hh @@ -55,6 +55,11 @@ extern Verbosity buildVerbosity; /* Maximum number of parallel build jobs. 0 means unlimited. */ extern unsigned int maxBuildJobs; +/* Number of CPU cores to utilize in parallel within a build, i.e. by passing + this number to Make via '-j'. 0 means that the number of actual CPU cores on + the local host ought to be auto-detected. */ +extern unsigned int buildCores; + /* Read-only mode. Don't copy stuff to the store, don't change the database. */ extern bool readOnlyMode; |