Sorry. Which I understand is that 'sweep termination = clean up = release the physical memory' The long comment is helpful. I got 'b. Sweep any unswept spans. There will only be unswept spans if this GC cycle was forced before the expected time.' Dose it means 'sweep = scan the root span', like java cms 'gc root scan'? not the release the physical memory?
在 2019年6月21日星期五 UTC+8上午8:54:31，Ian Lance Taylor写道： > > On Thu, Jun 20, 2019 at 9:56 AM Chou Yan <yan.ch...@gmail.com > <javascript:>> wrote: > > > > I look up the doc for gctrace: > > https://godoc.org/runtime > > it show us: > > > > 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, concurrent > > mark and scan, and STW mark termination. The CPU times > > for mark/scan 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. > > > > > > I am very confused. Will it be swt in the cleanup phase? > > I'm sorry, I don't understand what you are asking. What is the cleanup > phase? > > > And how many times gc stw? mark start? concurrent mark? remark ? or > sweep ? > > See the long comment near the top of runtime/mgc.go. Currently each > cycle stops the world twice, very briefly, in the sweep termination > and mark termination phases. > > Ian > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/58a54b06-271c-4c39-a891-2ec157c42ee9%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
