Use Jenkins executor-local PARALLEL value

Author: WardBrian

Jenkinsfile

@@ -7,9 +7,9 @@ def runTests(String testPath, boolean jumbo = false) {
         sh "cat make/local"
         sh "make print-compiler-flags"
         if (jumbo && !params.disableJumbo) {
-            sh "python3 runTests.py -j${env.PARALLEL} ${testPath} --jumbo --debug"
+            sh "python3 runTests.py -j${PARALLEL} ${testPath} --jumbo --debug"
         } else {
-            sh "python3 runTests.py -j${env.PARALLEL} ${testPath}"
+            sh "python3 runTests.py -j${PARALLEL} ${testPath}"
         }
     }
         finally { junit 'test/**/*.xml' }
@@ -61,7 +61,6 @@ pipeline {
         OPENCL_PLATFORM_ID = 1
         OPENCL_PLATFORM_ID_CPU = 0
         OPENCL_PLATFORM_ID_GPU = 0
-        PARALLEL = 4
         GIT_AUTHOR_NAME = 'Stan Jenkins'
         GIT_AUTHOR_EMAIL = 'mc.stanislaw@gmail.com'
         GIT_COMMITTER_NAME = 'Stan Jenkins'