From: Dan Carpenter <dan.carpenter@oracle.com>
To: Himanshu Jha <himanshujha199640@gmail.com>, smatch@vger.kernel.org
Subject: Hangs while building the cross function DB
Date: Mon, 28 Aug 2017 10:43:10 +0300 [thread overview]
Message-ID: <20170828074310.karya6frxeaz7x4j@mwanda> (raw)
In-Reply-To: <20170828064341.GA2506@himanshu-Vostro-3559>
Himanshu Jha had a question about hangs while building the cross
function DB.
Building the cross function DB used to hang my system for half an hour
but I kept tweaking it so now it's barely noticeable. I have a quad
core with 32GB of RAM. The problem is that Smatch is reading from the
warns.txt file and writing to smatch_db.sqlite file as fast as possible.
Both files are around 15-20GB. This IO pattern is very hard on the
default Linux IO schedulers.
The BFQ scheduler is designed to fix these hangs, so your best bet is to
try that.
https://unix.stackexchange.com/questions/375600/how-to-enable-and-use-the-bfq-scheduler
regards,
dan carpenter
parent reply other threads:[~2017-08-28 7:43 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20170828064341.GA2506@himanshu-Vostro-3559>]
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