gctrace: setting gctrace=1 causes the garbage collector to emit a single line to standard
error at each collection, summarizing the amount of memory collected and the
length of the pause. Setting gctrace=2 emits the same summary but also
- repeats each collection.
+ repeats each collection. The format of this line is subject to change.
+ Currently, it is:
+ gc # @#s #%: #+...+# ms clock, #+...+# ms cpu, #->#-># MB, # MB goal, # P
+ where the fields are as follows:
+ gc # the GC number, incremented at each GC
+ @#s time in seconds since program start
+ #% percentage of time spent in GC since program start
+ #+...+# wall-clock/CPU times for the phases of the GC
+ #->#-># MB heap size at GC start, at GC end, and live heap
+ # MB goal goal heap size
+ # P number of processors used
+ The phases are stop-the-world (STW) sweep termination, scan,
+ synchronize Ps, mark, and STW mark termination. The CPU times
+ for mark are broken down in to assist time (GC performed in
+ line with allocation), background GC time, and idle GC time.
+ If the line ends with "(forced)", this GC was forced by a
+ runtime.GC() call and all phases are STW.
memprofilerate: setting memprofilerate=X will update the value of runtime.MemProfileRate.
When set to 0 memory profiling is disabled. Refer to the description of