mirror of https://github.com/vector-im/riot-web
54 lines
2.4 KiB
Markdown
54 lines
2.4 KiB
Markdown
## Memory leaks
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Element usually emits slow behaviour just before it is about to crash. Getting a
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memory snapshot (below) just before that happens is ideal in figuring out what
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is going wrong.
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Common symptoms are clicking on a room and it feels like the tab froze and scrolling
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becoming jumpy/staggered.
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If you receive a white screen (electron) or the chrome crash page, it is likely
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run out of memory and it is too late for a memory profile. Please do report when
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this happens though so we can try and narrow down what might have gone wrong.
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## Memory profiles/snapshots
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When investigating memory leaks/problems it's usually important to compare snapshots
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from different points in the Element session lifecycle. Most importantly, a snapshot
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to establish the baseline or "normal" memory usage is useful. Taking a snapshot
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roughly 30-60 minutes after starting Element is a good time to establish "normal"
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memory usage for the app - anything after that is at risk of hiding the memory leak
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and anything newer is still in the warmup stages of the app.
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**Memory profiles can contain sensitive information.** If you are submitting a memory
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profile to us for debugging purposes, please pick the appropriate Element developer and
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send them over an encrypted private message. *Do not share your memory profile in
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public channels or with people you do not trust.*
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### Taking a memory profile (Firefox)
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1. Press CTRL+SHIFT+I (I as in eye).
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2. Click the Memory tab.
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3. Press the camera icon in the top left of the pane.
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4. Wait a bit (coffee is a good option).
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5. When the save button appears on the left side of the panel, click it to save the
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profile locally.
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6. Compress the file (gzip or regular zip) to make the file smaller.
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7. Send the compressed file to whoever asked for it (if you trust them).
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While the profile is in progress, the tab might be frozen or unresponsive.
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### Taking a memory profile (Chrome/Desktop)
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1. Press CTRL+SHIFT+I (I as in eye).
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2. Click the Memory tab.
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3. Select "Heap Snapshot" and the app.element.io VM instance (not the indexeddb one).
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4. Click "Take Snapshot".
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5. Wait a bit (coffee is a good option).
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6. When the save button appears on the left side of the panel, click it to save the
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profile locally.
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7. Compress the file (gzip or regular zip) to make the file smaller.
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8. Send the compressed file to whoever asked for it (if you trust them).
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While the profile is in progress, the tab might be frozen or unresponsive.
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