diff options
Diffstat (limited to 'libgo/go/runtime/extern.go')
| -rw-r--r-- | libgo/go/runtime/extern.go | 28 |
1 files changed, 13 insertions, 15 deletions
diff --git a/libgo/go/runtime/extern.go b/libgo/go/runtime/extern.go index e2e601f..96af606 100644 --- a/libgo/go/runtime/extern.go +++ b/libgo/go/runtime/extern.go @@ -78,21 +78,6 @@ It is a comma-separated list of name=val pairs setting these named variables: If the line ends with "(forced)", this GC was forced by a runtime.GC() call. - Setting gctrace to any value > 0 also causes the garbage collector - to emit a summary when memory is released back to the system. - This process of returning memory to the system is called scavenging. - The format of this summary is subject to change. - Currently it is: - scvg#: # MB released printed only if non-zero - scvg#: inuse: # idle: # sys: # released: # consumed: # (MB) - where the fields are as follows: - scvg# the scavenge cycle number, incremented at each scavenge - inuse: # MB used or partially used spans - idle: # MB spans pending scavenging - sys: # MB mapped from the system - released: # MB released to the system - consumed: # MB allocated from the system - madvdontneed: setting madvdontneed=1 will use MADV_DONTNEED instead of MADV_FREE on Linux when returning memory to the kernel. This is less efficient, but causes RSS numbers to drop @@ -112,6 +97,19 @@ It is a comma-separated list of name=val pairs setting these named variables: scavenge: scavenge=1 enables debugging mode of heap scavenger. + scavtrace: setting scavtrace=1 causes the runtime to emit a single line to standard + error, roughly once per GC cycle, summarizing the amount of work done by the + scavenger as well as the total amount of memory returned to the operating system + and an estimate of physical memory utilization. The format of this line is subject + to change, but currently it is: + scav # KiB work, # KiB total, #% util + where the fields are as follows: + # KiB work the amount of memory returned to the OS since the last scav line + # KiB total how much of the heap at this point in time has been released to the OS + #% util the fraction of all unscavenged memory which is in-use + If the line ends with "(forced)", then scavenging was forced by a + debug.FreeOSMemory() call. + scheddetail: setting schedtrace=X and scheddetail=1 causes the scheduler to emit detailed multiline info every X milliseconds, describing state of the scheduler, processors, threads and goroutines. |