Tsuna's blog

If you ever run into this message while using the Sun JVM / OpenJDK: Java HotSpot(TM) 64-Bit Server VM warning: GC locker is held; pre-dump ...

After reading the excellent post on The MySQL “swap insanity” problem and the effects of the NUMA architecture , I remembered about the exis...

At StumbleUpon we've been tracking down a weird problem with one of our application servers written in Java. We run Sun's jdk1.6.0_...

I recently did some work on some of our frontend machines (on which we run Varnish ) at StumbleUpon and decided to track down some of the er...

I have a fairly simple problem: I want to count the number of lines in a file, then seek back to after the first line, and then read the fil...

I will be speaking about OpenTSDB at the Strata conference , Wednesday, February 02, 2011, in Santa Clara, CA. You can sign up with this ...

That's a interesting question I'm willing to spend some of my time on. Someone at StumbleUpon emitted the hypothesis that with all ...

Today I was puzzled for a short while by a machine on which Python seemed to be acting up: $ python Python 2.5.2 (r252:60911, Jan 20 2010, 2...

I implemented a command-line tool to discover and read JMX attributes on Java processes to make it easier to write monitoring scripts for th...

I recently came across PMP and found it surprisingly useful to troubleshoot and analyze live production systems, despite it being so ridicu...