Hi Than,
Thanks for the tip.
I actually discovered that selecting a node and using the Focus option from
the Refine in
the web view gets me a clear view of the callers and callees for the
selected node.
I have tried the tree view, passing the focus option on the command line
but I' don't understand
how to read it.
Here is a snippet from the top of the output for tree
Showing nodes accounting for 20.68s, 15.59% of 132.61s total
----------------------------------------------------------+-------------
flat flat% sum% cum cum% calls calls% + context
----------------------------------------------------------+-------------
0.04s 0.19% | time.Now
20.65s 15.57% 15.57% 20.68s 15.59% | time.now
0.03s 0.15% |
runtime.nanotime
----------------------------------------------------------+-------------
0.03s 100% | time.now
0.03s 0.023% 15.59% 0.03s 0.023% | runtime.nanotime
----------------------------------------------------------+-------------
0.02s 100% |
github.com/piersy/new_project/worker.NewWorker.func1
0 0% 15.59% 0.02s 0.015% |
github.com/piersy/new_project/network.(*Connection).Read
0.02s 100% |
github.com/piersy/new_project/network.(*Connection).read
----------------------------------------------------------+-------------
0.01s 100% |
github.com/piersy/new_project/worker.(*Listener).listen.func1
0 0% 15.59% 0.01s 0.0075% |
github.com/piersy/new_project/network.(*Connection).Write
0.01s 100% |
github.com/piersy/new_project/network.(*Connection).write
----------------------------------------------------------+-------------
0.02s 100% |
github.com/piersy/new_project/network.(*Connection).Read
0 0% 15.59% 0.02s 0.015% |
github.com/piersy/new_project/network.(*Connection).read
0.02s 100% | time.Now
----------------------------------------------------------+-------------
0.01s 100% |
github.com/piersy/new_project/network.(*Connection).Write
0 0% 15.59% 0.01s 0.0075% |
github.com/piersy/new_project/network.(*Connection).write
0.01s 100% | time.Now
----------------------------------------------------------+-------------
In the web view when focused on time.now I can see the lower entries
entries appearing in the call
hierarchy leading to time.now, but here in the tree view they appear
disconnected, the only hint that
these entries call time.now is that I used the focus flag to focus on
time.now.
In the case that I haven't used the focus flag, I'm wondering how I would
be able to relate entries in
the tree to one another?
I also tried using the peek flag, which if set to time.now, only prints the
first
entry from the tree output above.
On Mon, Oct 21, 2019 at 8:10 AM Than McIntosh <th...@google.com> wrote:
> It can sometimes be useful in such situations to look at the pprof "tree"
> output style (as opposed to graph).
>
> Than
>
>
> On Sat, Oct 19, 2019 at 4:14 AM Piers Powlesland <
> pierspowlesl...@gmail.com> wrote:
>
>> Kind of, but due to the sheer number of nodes and edged the edges end up
>> lying on top of each other so in certain cases you end up having to check
>> the source of several nodes to see which is the caller.
>>
>> On Sat, 19 Oct 2019, 03:08 Robert Engels, <reng...@ix.netcom.com> wrote:
>>
>>> But also can’t you just find that node in the graph and see the callers?
>>>
>>> On Oct 18, 2019, at 8:54 PM, Robert Engels <reng...@ix.netcom.com>
>>> wrote:
>>>
>>>
>>> Yes. When using the command pprof viewer there is a way to show the
>>> hotspots with the callers. Again I don’t have access to dev at the moment.
>>>
>>> On Oct 18, 2019, at 8:44 PM, Piers Powlesland <pierspowlesl...@gmail.com>
>>> wrote:
>>>
>>>
>>> Hi Robert,
>>>
>>> I think I found the options you were referring to, and I was able to get
>>> the whole overview with the following.
>>>
>>> go tool pprof -http :9999 -edgefraction 0 -nodefraction 0 -nodecount
>>> 100000 cpu.prof
>>>
>>> Its a bit of a screenfull though, and I was wondering if there is any
>>> simpler way to find out who is calling what?
>>> So that I could dig down through top and if the function isn't in my
>>> code follow the callstack to find what part of my code
>>> initiated the call.
>>>
>>> On Fri, Oct 18, 2019 at 8:52 PM Robert Engels <reng...@ix.netcom.com>
>>> wrote:
>>>
>>>> I am pretty sure there is a way to filter nodes that are less than X %,
>>>> and some of that filtering is on by default - so you may want to turn that
>>>> off (can't say for sure since not at dev machine right now).
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> -----Original Message-----
>>>> >From: Ian Lance Taylor <i...@golang.org>
>>>> >Sent: Oct 18, 2019 2:43 PM
>>>> >To: Piers Powlesland <pierspowlesl...@gmail.com>
>>>> >Cc: golang-nuts <golang-nuts@googlegroups.com>
>>>> >Subject: Re: [go-nuts] pprof not showing call hierarchy for time.now
>>>> and time.Until
>>>> >
>>>> >On Fri, Oct 18, 2019 at 12:37 PM <pierspowlesl...@gmail.com> wrote:
>>>> >>
>>>> >> I used pprof to get an overview of where time is being spent in my
>>>> latest project and I'm
>>>> >> getting a result I don't understand. When using the web view, there
>>>> are certain function
>>>> >> calls that are taking up a large percentage of the time but they
>>>> appear un-rooted as in
>>>> >> there seems to be no parent call calling them.
>>>> >>
>>>> >> I have attached a picture of the web view showing just the un-rooted
>>>> functions.
>>>> >>
>>>> >> I generated the profile with the following command.
>>>> >>
>>>> >> go test -cpuprofile cpu.prof -count 4 . -run MyTest
>>>> >>
>>>> >> and I viewed the profile with the following command.
>>>> >>
>>>> >> go tool pprof -http :9999 cpu.prof
>>>> >>
>>>> >> I'd really like to track down what is causing all this time in the
>>>> time package, but I'm
>>>> >> at a bit of a loss.
>>>> >
>>>> >Which version of Go and which GOOS/GOARCH? There have been bugs in
>>>> >this area in the past, and at least some of them are fixed in 1.13.
>>>> >
>>>> >Ian
>>>> >
>>>> >--
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>>>> .
>>>>
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