Thanks for the pointer! I am still puzzled by the former (allocation
associated with the import line). I thought it could be an init() function
in this file, but that does not explain it...
On Monday, December 4, 2017 at 5:47:09 PM UTC-8, Dave Cheney wrote:
>
>
>
> On Tuesday, 5 December 2017 12:09:54 UTC+11, Sangjin Lee wrote:
>>
>> A couple of questions on understanding go pprof's memory profile...
>>
>> When I list a certain function (with --alloc_objects), I see an
>> allocation number associated with an import line mysteriously. I am pretty
>> certain I can rule out any source line offset. For example,
>>
>> (pprof) list foo
>> Total: 534804146
>> ROUTINE ======================== (snip)
>> 24057960 27540717 (flat, cum) 5.15% of Total
>> . . 1:package protocol
>> . . 2:
>> . . 3:import (
>> 12092676 12092676 4: "bytes"
>> . . 5: "fmt"
>> . . 6: "net/url"
>> . . 7: "strconv"
>> . . 8: "strings"
>> . . 9: "time"
>> . . 10: "unicode"
>> . . 11:)
>>
>> Any idea how to interpret this?
>>
>> In addition, is there a way to drill down further into exactly what type
>> of memory allocation is contributing to the allocation when I list a
>> function? The tree/web/pdf view doesn't break down further function names
>> (only shows the boxes with what I believe is the individual allocation
>> size). I'm kind of guessing from the line of code on what it is, but it'd
>> be great if there is a way to track down exactly what type of memory
>> allocation it is (string copy, map growth, byte allocation, etc.). For
>> example,
>>
>> (pprof) list add
>> Total: 534804146
>> ROUTINE ======================== (snip)
>> 17248777 17248777 (flat, cum) 3.23% of Total
>> . . 220: l *logger
>> . . 221:}
>> . . 222:
>> . . 223:func (l *logger) add(data
>> map[string]interface{}) {
>> . . 224: if id := l.Id(); id != "" {
>> 17248777 17248777 225: data[ID] = id
>> . . 226: }
>> . . 227:}
>> . . 228:
>>
>> where id is a string.
>>
>
> The allocations are taking the address of the value of id when it is boxed
> into an interface{}
>
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