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MAT Histogram Objects count is not equal Android Studio Profiler [message #1857018]

Fri, 13 January 2023 02:29

Leo Wang

Messages: 1
Registered: January 2023

Junior Member

I use Android Studio Profiler dump heap
the use hprof-conv to convert the heap file into a standard format
$ANDROID_HOME/platform-tools/hprof-conv memory-20230112T162214.hprof memory-20230112T162214.conv.hprof

but the MAT Histogram Objects count is not equal Android Studio Profiler
for example
In Android Studio Profiler
byte[] count is 106251=82773+24578+5564

MAT Histogram display byte[] count 106251

Eclipse Memory Analyzer Version 1.13.0
index.php/fa/42835/0/

Attachment: android_profiler-byte-count-112915.png
(Size: 227.00KB, Downloaded 201 times)
Attachment: android_profiler-conv-byte-count-112915.png
(Size: 371.96KB, Downloaded 214 times)
Attachment: mat-byte-count-106251.png
(Size: 315.57KB, Downloaded 192 times)

[Updated on: Tue, 17 January 2023 06:15]

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Re: MAT Histogram Objects count is not equal Android Studio Profiler [message #1857162 is a reply to message #1857018]

Fri, 20 January 2023 11:07

Andrew Johnson

Messages: 205
Registered: July 2009

Senior Member

So from
Quote:

In Android Studio Profiler
byte[] count is 106251=82773+24578+5564

MAT Histogram display byte[] count 106251

the counts seem the same, but the count in Android Studio Profiler memory-20230112T162214.conv.hprof is 112015.

One guess could be that the extra objects are unreachable and have been discarded by MAT. Check in the unreachable objects histogram.
Perhaps with the original file memory-20230112T162214.hprof in Android Studio Profiler those objects are shown in another heap, hence the match in size of 106251, but once converted all the objects are just put in one heap.

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