build,win: limit maxcpucount to 2 for MSBuild

joaocgreis · joaocgreis · commit 6cfedf0481c3 · 2017-04-11T11:24:40.000+01:00
MSBuild invokes cl.exe with /MP (set in common.gypi), making it compile sources in parallel using a number of internal processes equal to the number of effective processors. MSBuild /m uses a similar mechanism, so the number of compiler processes can grow to the number of effective processors squared. This limits MSBuild to 2 processes, to still use some parallelization while requiring less memory. Cl.exe is still invoked with /MP, thus the maximum number of processes is limited to twice the number of effective processors. PR-URL: #12184 Reviewed-By: Refael Ackermann <refack@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
diff --git a/vcbuild.bat b/vcbuild.bat
@@ -190,9 +190,11 @@ echo Project files generated.
 if defined nobuild goto sign
 
 @rem Build the sln with msbuild.
+set "msbcpu=/m:2"
+if "%NUMBER_OF_PROCESSORS%"=="1" set "msbcpu=/m:1"
 set "msbplatform=Win32"
 if "%target_arch%"=="x64" set "msbplatform=x64"
-msbuild node.sln /m /t:%target% /p:Configuration=%config% /p:Platform=%msbplatform% /clp:NoSummary;NoItemAndPropertyList;Verbosity=minimal /nologo
+msbuild node.sln %msbcpu% /t:%target% /p:Configuration=%config% /p:Platform=%msbplatform% /clp:NoSummary;NoItemAndPropertyList;Verbosity=minimal /nologo
 if errorlevel 1 goto exit
 if "%target%" == "Clean" goto exit
 
