0.14 ignoring dbcache #9967

issue mb300sd opened this issue on March 9, 2017

mb300sd commented at 11:35 PM on March 9, 2017: contributor
Describe the issue

0.14 is ignoring dbcache, cache grows until out of memory

Can you reliably reproduce the issue?

yes

If so, please list the steps to reproduce below:
1. Do initial sync with bitcoind -dbcache=1000
2. tail -f debug.log during sync
Expected behaviour

cache size should stop at 1000mb

Actual behaviour

bitcoind runs out of memory

Machine specs:
- OS: Debian Stretch
- CPU: N3050
- RAM: 4GB
- Disk size: 256GB
- Disk Type (HD/SDD): SSD
sipa commented at 11:40 PM on March 9, 2017: member

Since 0.14, the dbcache will borrow unused memory space from the mempool, so it can grow to 1.3 GB in your case (assuming you didn't increase the mempool). Also, bitcoind can use a few hundred MB of RAM in addition to the mempool and dbcache.

How do you observe that it grows beyond 1000mb?
mb300sd commented at 11:42 PM on March 9, 2017: contributor

No longer have the debug.log, but I was staring at tail -f and it kept rising above the dbcache setting until it ran out of memory. Lost about 4 hours of syncing.
mb300sd commented at 11:48 PM on March 9, 2017: contributor

I'll see if it goes much above 1300. I kept stopping and restarting it to save progress.
mb300sd commented at 11:59 PM on March 9, 2017: contributor

Never mind, looks like a non issue.
mb300sd closed this on Mar 9, 2017
MarcoFalke locked this on Sep 8, 2021

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