The following test needs a slightly longer timeout when running
in configuration with high parallelism:

    runtime/RedefineTests/RedefineRunningMethods.java

I have run into timeouts with this test in my Thread-SMR
stress testing where I run 16 parallel tests. When I changed
the timeout from the default of 120 to 180, the test stopped
timing out.

$ hg diff test/hotspot/jtreg/runtime/RedefineTests/RedefineRunningMethods.java
diff -r 7148f4f60366 test/hotspot/jtreg/runtime/RedefineTests/RedefineRunningMethods.java
--- a/test/hotspot/jtreg/runtime/RedefineTests/RedefineRunningMethods.java Mon Aug 06 17:37:59 2018 -0400
+++ b/test/hotspot/jtreg/runtime/RedefineTests/RedefineRunningMethods.java Mon Aug 06 17:41:32 2018 -0400
@@ -31,7 +31,7 @@
  * java.instrument
  * jdk.jartool/sun.tools.jar
  * @run main RedefineClassHelper
- * @run main/othervm -javaagent:redefineagent.jar -Xlog:redefine+class+iklass+add=trace,redefine+class+iklass+purge=trace,all=trace:file=all.log RedefineRunningMethods
+ * @run main/othervm/timeout=180 -javaagent:redefineagent.jar -Xlog:redefine+class+iklass+add=trace,redefine+class+iklass+purge=trace,all=trace:file=all.log RedefineRunningMethods
  */
 // Test is executed with full trace logging redirected to a file to ensure there is no crash during logging anonymous classes - see JDK-8197901

I use the following timeoutFactor values:

# jtreg default is "othervm", run-test default is "agentvm"
TEST_MODE="othervm"
case "$cfg" in
release)
    TIMEOUT="4"
    ;;
fastdebug)
    TIMEOUT="6"
    ;;
slowdebug)
    TIMEOUT="12"
    ;;
esac