Analyze Disk Usage in Mac
As a developer reported the OpenAI Codex bug could potentially destroy your SSD in a year, I took a look at the disk usage in the Activity Monitor. Surprise surprise, the app with most IOPS was, Linear; followed by Antigravity.
With fs_usage -f pathname 1299, we can peek into the the file access pattern of a process in real-time.
sudo fs_usage -f pathname 1299`
21:44:43.798680 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/000482.ldb 0.000002 Linear.13039
21:44:43.798681 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/000480.ldb 0.000002 Linear.13039
21:44:43.798682 close F=73 0.000001 Linear.13039
21:44:43.798737 fstatat64 [-2]//Users/kunxi/Library/Application Support/Linear/Session Storage/000478.log 0.000003 Linear.13039
21:44:43.799623 unlinkat [-2]//Users/kunxi/Library/Application Support/Linear/Session Storage/000478.log 0.000886 Linear.13039
21:44:50.345455 mkdir [ 17] /Users/kunxi/Library/Application Support/Linear/sentry 0.000109 Linear.13113
21:44:50.345598 stat64 /Users/kunxi/Library/Application Support/Linear/sentry 0.000048 Linear.13114
21:44:50.346311 open F=73 (_WC_T______X___) /Users/kunxi/Library/Application Support/Linear/sentry/scope_v3.json 0.000343 Linear.13115
21:44:50.347733 close F=73 0.000299 Linear.13113
21:44:51.814743 open F=73 (_WC_T__________) sers/kunxi/Library/Application Support/Linear/Session Storage/000483.log 0.000575 Linear.13037
21:44:51.814824 close F=69 0.000063 Linear.13037
21:44:51.816139 open F=69 (_WC_T__________) sers/kunxi/Library/Application Support/Linear/Session Storage/000484.ldb 0.000341 Linear.13039
21:44:51.819922 close F=69 0.000026 Linear.13039
21:44:51.820041 open F=69 (R______________) sers/kunxi/Library/Application Support/Linear/Session Storage/000484.ldb 0.000112 Linear.13039
21:44:51.820636 open F=74 (R______________) /Users/kunxi/Library/Application Support/Linear/Session Storage 0.000107 Linear.13039
21:44:51.821070 close F=74 0.000007 Linear.13039
21:44:51.821494 open F=74 (R__________X___) /Users/kunxi/Library/Application Support/Linear/Session Storage 0.000069 Linear.13039
21:44:51.821560 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/MANIFEST-000001 0.000015 Linear.13039
21:44:51.821568 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/LOCK 0.000007 Linear.13039
21:44:51.821576 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/000005.ldb 0.000007 Linear.13039
21:44:51.821584 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/000483.log 0.000007 Linear.13039
21:44:51.821591 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/000481.log 0.000007 Linear.13039
21:44:51.821600 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/CURRENT 0.000007 Linear.13039
21:44:51.821604 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/LOG 0.000004 Linear.13039
21:44:51.821608 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/000484.ldb 0.000004 Linear.13039
21:44:51.821614 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/LOG.old 0.000006 Linear.13039
21:44:51.821621 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/000482.ldb 0.000006 Linear.13039
21:44:51.821630 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/000480.ldb 0.000009 Linear.13039
21:44:51.821633 close F=74 0.000002 Linear.13039
21:44:51.821673 open F=74 (R__________X___) /Users/kunxi/Library/Application Support/Linear/Session Storage 0.000027 Linear.13039
21:44:51.821697 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/MANIFEST-000001 0.000004 Linear.13039
21:44:51.821701 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/LOCK 0.000003 Linear.13039
21:44:51.821704 stat64 /Users/kunxi/Library/Application Support/Linear/Session Storage/000005.ldb 0.000003 Linear.13039The IOPS can be categorized as telemetry and cache. The Linear app streamed the UI events to sentry/scope_v3.json,
then maybe batched to Sentry as telemetry.
cat /Users/kunxi/Library/Application\ Support/Linear/sentry/scope_v3.json | jq '.scope.breadcrumbs[0:3]'
[
{
"timestamp": 1782274519.769,
"category": "electron",
"message": "app.did-become-active",
"type": "ui"
},
{
"timestamp": 1782274523.165,
"category": "electron",
"message": "app.did-resign-active",
"type": "ui"
},
{
"timestamp": 1782275633.005,
"category": "electron",
"message": "app.did-become-active",
"type": "ui"
}
]The timestamp field in the breadcrumbs indicates that the events were current:
date -r 1782274519
Tue Jun 23 21:15:19 PDT 2026Linear also persists the session cache to the LevelDB, total 593 entries:
~/go/bin/ldbdump ~/Library/Application\ Support/Linear/Session\ Storage/*.ldb | wc -l
593It is worthy noting that I usually kept Linear open for a few weeks. The IOPS amortized over time might not be too much concerning. I closed the app, and restarted it at Jun 23 10:37 PM PST, and would keep it running for a few days, and I will report back.