uid

README

Dropped 61 nodes (cum <= 6.05MB)
Showing top 10 nodes out of 52 (cum >= 149.99MB)
      flat  flat%   sum%        cum   cum%
  315.56MB 26.10% 26.10%   315.56MB 26.10%  github.com/dgraph-io/dgraph/posting.NewList
   87.51MB  7.24% 33.33%    87.51MB  7.24%  github.com/dgraph-io/dgraph/uid.stringKey
      80MB  6.62% 39.95%   105.50MB  8.72%  github.com/dgraph-io/dgraph/uid.(*lockManager).newOrExisting
   78.01MB  6.45% 46.40%    78.01MB  6.45%  github.com/dgraph-io/dgraph/posting.Key
   77.50MB  6.41% 52.81%      155MB 12.82%  github.com/zond/gotomic.(*Hash).getBucketByIndex
   77.50MB  6.41% 59.22%    77.50MB  6.41%  github.com/zond/gotomic.newMockEntry
   74.50MB  6.16% 65.38%    74.50MB  6.16%  github.com/zond/gotomic.newRealEntryWithHashCode
      51MB  4.22% 69.60%    74.01MB  6.12%  github.com/dgraph-io/dgraph/posting.(*List).merge
   48.50MB  4.01% 73.61%    48.50MB  4.01%  github.com/dgraph-io/dgraph/loader.(*state).readLines
   43.50MB  3.60% 77.21%   149.99MB 12.40%  github.com/zond/gotomic.(*Hash).PutIfMissing
(pprof) list uid.stringKey
Total: 1.18GB
ROUTINE ======================== github.com/dgraph-io/dgraph/uid.stringKey in /home/manishrjain/go/src/github.com/dgraph-io/dgraph/uid/assigner.go
   87.51MB    87.51MB (flat, cum)  7.24% of Total
         .          .    186:   rerr := pl.AddMutation(t, posting.Set)
         .          .    187:   return uid, rerr
         .          .    188:}
         .          .    189:
         .          .    190:func stringKey(xid string) []byte {
   87.51MB    87.51MB    191:   var buf bytes.Buffer
         .          .    192:   buf.WriteString("_uid_|")
         .          .    193:   buf.WriteString(xid)
         .          .    194:   return buf.Bytes()
         .          .    195:}
         .          .    196:

After changing the code to return []byte("_uid_" + xid), the memory profiler no longer shows it.

$ go tool pprof uidassigner mem.prof 
Entering interactive mode (type "help" for commands)
(pprof) top10
907.59MB of 1139.29MB total (79.66%)
Dropped 86 nodes (cum <= 5.70MB)
Showing top 10 nodes out of 48 (cum >= 45.01MB)
      flat  flat%   sum%        cum   cum%
  310.56MB 27.26% 27.26%   310.56MB 27.26%  github.com/dgraph-io/dgraph/posting.NewList
      89MB  7.81% 35.07%       89MB  7.81%  github.com/zond/gotomic.newMockEntry
   81.50MB  7.15% 42.23%   170.51MB 14.97%  github.com/zond/gotomic.(*Hash).getBucketByIndex
   81.50MB  7.15% 49.38%      109MB  9.57%  github.com/dgraph-io/dgraph/uid.(*lockManager).newOrExisting
   76.51MB  6.72% 56.09%    76.51MB  6.72%  github.com/dgraph-io/dgraph/posting.Key
   72.50MB  6.36% 62.46%    72.50MB  6.36%  github.com/zond/gotomic.newRealEntryWithHashCode
   55.50MB  4.87% 67.33%    63.50MB  5.57%  github.com/dgraph-io/dgraph/posting.(*List).merge
      50MB  4.39% 71.72%       50MB  4.39%  github.com/dgraph-io/dgraph/loader.(*state).readLines
   45.50MB  3.99% 75.71%   150.52MB 13.21%  github.com/zond/gotomic.(*Hash).PutIfMissing
   45.01MB  3.95% 79.66%    45.01MB  3.95%  github.com/google/flatbuffers/go.(*Builder).growByteBuffer

Documentation

Index

• func ExternalId(uid uint64) (xid string, rerr error)
• func Get(xid string) (uid uint64, rerr error)
• func GetOrAssign(xid string, instanceIdx uint64, numInstances uint64) (uid uint64, rerr error)
• func Init(ps *store.Store)
• func StringKey(xid string) []byte

Functions

func ExternalId

func ExternalId(uid uint64) (xid string, rerr error)

func Get

func Get(xid string) (uid uint64, rerr error)

func GetOrAssign

func GetOrAssign(xid string, instanceIdx uint64,
	numInstances uint64) (uid uint64, rerr error)

func Init

func Init(ps *store.Store)

func StringKey

func StringKey(xid string) []byte