Vincenzo's Thoughts Repository

eclipse indigo and SVN

Vincenzo — Fri, 06 Jan 2012 13:45:26 +0000

Over the past few years I’ve tried many combination: console svn + eclipse, subeclipse, subversive, etc…

With eclipse indigo I think I’ve found the perfect combination: subversive 2.2.2 + subversive java HL connector + java hl 1.6 + svn 1.6.

Installation procedure:

1. Install svn (apt-get install svn)
2. Install the java svn bridge (apt-get install libsvn-java)
3. Install eclipse helios (from www.eclipse.org)
4. Install the subversive plug-in for eclipse (Help->Install New Software->Indigo Repository->Collaboration->Subversive SVN)

Tweaks:
1. Add libjavasvn to the JVM library path: add ‘-Djava.library.path=/usr/lib/jni’ to the ‘-vmargs’ section of eclipse.ini
2. Fix the gnome keyring access violation: add ‘password-stores =’ to the ‘[auth]‘ section of ~.subversion/config

Enjoy!

Simple awk statistics

Vincenzo — Thu, 22 Dec 2011 09:09:20 +0000

gawk -F"[= ]" '{ sum = sum + $NF; count = count + 1; if ($NF > max) max = $NF; } END { printf"count=%d avg=%d max=%d\n", count, sum/count, max}'

awk gawk to remember

Vincenzo — Thu, 15 Dec 2011 10:22:55 +0000

This script:

specifies the delimiter as a regex
filters input line based on a regex ( regex right after the first single quote)
cycles through fields
tests a field against a regex (if block in the loop)

gawk -F"[=\x01]" '/35=AE.*150=F/ { for (i=1; i<=NF; i=i+2) { if ($i ~/^(52|55|32|31|1117|1121|782|785)$/) { printf "%s,",$(i+1)} } printf "\n" }' file_to_parse.log

A nice tool to monitor intel’s CPU counters

Vincenzo — Tue, 13 Dec 2011 15:19:21 +0000

http://software.intel.com/en-us/articles/intel-performance-counter-monitor/

root@vcaruso-ubuntu-t5500:/home/vcaruso/src/IntelPerformanceCounterMonitorV1.7# ./pcm.x 1


EXEC : instructions per nominal CPU cycle

IPC : instructions per CPU cycle

FREQ : relation to nominal CPU frequency='unhalted clock ticks'/'invariant timer ticks' (includes Intel Turbo Boost)

AFREQ : relation to nominal CPU frequency while in active state (not in power-saving C state)='unhalted clock ticks'/'invariant timer ticks while in C0-state' (includes Intel Turbo Boost)

L3MISS: L3 cache misses

L2MISS: L2 cache misses (including other core's L2 cache *hits*)

L3HIT : L3 cache hit ratio (0.00-1.00)

L2HIT : L2 cache hit ratio (0.00-1.00)

L3CLK : ratio of CPU cycles lost due to L3 cache misses (0.00-1.00), in some cases could be >1.0 due to a higher memory latency

L2CLK : ratio of CPU cycles lost due to missing L2 cache but still hitting L3 cache (0.00-1.00)

READ : bytes read from memory controller (in GBytes)

WRITE : bytes written to memory controller (in GBytes)

Core (SKT) | EXEC | IPC | FREQ | AFREQ | L3MISS | L2MISS | L3HIT | L2HIT | L3CLK | L2CLK | READ | WRITE
0 1 0.03 0.25 0.12 1.04 319 4131 0.92 0.04 0.07 0.17 N/A N/A

1 1 1.19 1.14 1.05 1.06 105 2803 0.96 0.96 0.00 0.01 N/A N/A

2 1 0.01 0.24 0.06 1.04 208 1152 0.82 0.04 0.08 0.09 N/A N/A

3 1 0.01 0.28 0.04 1.04 18 783 0.98 0.00 0.01 0.11 N/A N/A

4 0 0.03 0.37 0.07 0.48 566 2359 0.76 0.12 0.20 0.13 N/A N/A

5 0 0.12 0.55 0.22 0.76 591 4982 0.88 0.37 0.07 0.11 N/A N/A

6 0 0.01 0.32 0.03 0.48 13 753 0.98 0.00 0.01 0.12 N/A N/A

7 0 0.02 0.37 0.06 0.48 210 1666 0.87 0.08 0.09 0.16 N/A N/A

------------------------------------------------------------------------------------------------------------

SKT 0 0.02 0.43 0.04 0.56 1920 17 K 0.89 0.18 0.09 0.15 0.00 0.00

SKT 1 0.20 0.85 0.24 1.05 15 K 25 K 0.39 0.73 0.26 0.04 0.00 0.00

------------------------------------------------------------------------------------------------------------

TOTAL * 0.17 0.96 0.18 0.96 17 K 47 K 0.63 0.84 0.09 0.03 0.00 0.00
Instructions retired: 32 M ; Active cycles: 34 M ; Time (TSC): 7144 Kticks ; C0 (active,non-halted) core residency: 18.46 %
PHYSICAL CORE IPC : 0.96 => corresponds to 23.94 % utilization for cores in active state

Instructions per nominal CPU cycle: 0.17 => corresponds to 4.22 % core utilization over time interval
Intel(r) QPI data traffic estimation in bytes (data traffic coming to CPU/socket through QPI links):

QPI0 QPI1 ---------------------------------------------------------------------------------------------- SKT 0 178 K 380 K SKT 1 221 K 42 K ---------------------------------------------------------------------------------------------- Total QPI incoming data traffic: 823 K QPI data traffic/Memory controller traffic: 0.62

JNI stack overflow

Vincenzo — Mon, 27 Dec 2010 15:11:46 +0000

when calling java from a native thread via jni you may run into a synthetic stack overflow exception thrown by the jvm leading to a jvm crash. This may happen if the native’s thread remaining stack size is lower (stack grows downwards) than the reserved stack size defined by the jvm’s options -XXStackYellowPages -XXStackRedPages -XXStackShadowPages. Obviously the native thread doesn’t know of this constraint so it grows its stack until the limit and you may run into troubles if you’re allocating big arrays on the stack.
To solve this issue you may either increase the native thread stack size or decrease the amount of pages reserved by the jvm by tweaking those parameters above.

Right tcpdump

Vincenzo — Wed, 01 Dec 2010 15:56:39 +0000

tcpdump -ieth2 -C1 -s0 host 194.110.100.1 -w capture.pcap

Less with colors

Vincenzo — Thu, 14 Oct 2010 08:19:33 +0000

less -R

(F to follow the tail)

Welcome to the desert

Vincenzo — Sun, 29 Aug 2010 01:07:27 +0000

Welcome to the desert, originally uploaded by Vincenzo Caruso.

Flickr

Vincenzo — Mon, 15 Mar 2010 21:20:11 +0000

This is a test post from , a fancy photo sharing thing.

Notes 8 on Ubuntu: restoring the default fonts

Vincenzo — Mon, 18 Aug 2008 08:33:09 +0000

I just installed Notes 8 on ubuntu using an IBM prepacked deb package. Everything went smootly, the only issue is related to the fonts. Notes has luxy-courier as the default font, and this font is not installed by default on the ubuntu/debian systems. To fix this issue just install the ttf-xfree86-nonfree package, if you are ok with non-free packages. Otherwise change the default font from Luxy-Courier to Arial or Courier.