Start from a specific situation: you are on a tight schedule, with pressure from management to approve or prove an issue on the software release being tested, and the counterpart R&D team blames you that the metrics are wrong. Actually, you check the application and they are right… looking into the source code u see the bug, u fix it, and within hours u are back on the main business, finalizing the testing activity. Now, what would have happened with a proprietary testing tool? You couldn’t have checked the code. You would have had to argue with the ur R&D team about the existence of the issue, and with the vendor on the other side. Project would have been delayed or QA totally skipped, with all the risk it takes having a potentially broken release in production. Is it worth the money of the proprietary tool? I preferred to convince my management to spend in R&D resources in my team, and get a solution we could trust. It has proven to be a good choice

Tags: Load testing, capacity planning, opensource, freesoftware, software libero, testing, QA, quality assurance

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yes, it is a religion

ext link: neurope.eu

WTF???

…the cache is not used for queries of the following types:

* Prepared statements
* Queries that are a subquery of an outer query
* Queries executed within the body of a stored function or trigger

http://dev.mysql.com/doc/refman/5.0/en/query-cache-operation.html

+

For certain cases, a correlated subquery is optimized. For example:

val IN (SELECT key_val FROM tbl_name WHERE correlated_condition)

Otherwise, they are inefficient and likely to be slow. Rewriting the query as a join might improve performance.

http://dev.mysql.com/doc/refman/5.1/en/correlated-subqueries.html

I have 5 nested views… from 1 to 4, I have GROUP BY, ORDER BY, JOIN of the data over themselfs and other amenities… and on a ~2milion rows table, it doesn’t take more than 14 seconds…

the last view… has a subquery… evaluating the data related to the “currently evaluated row”, looking on the same table for values of “the same group”… and it gets DAMN SLOW… cause the “query cache” mechanism of MySQL does not kick in

k, tomorrow morning I go for the rewriting… I’ll create a VIEW about the data I need to be correlated, and I’ll JOIN it… let’s see

in one word… BUGGY …try it here

http://github.com/diaspora/diaspora/issues/#issue/16

we need a used/cheap rack for FSFE Headquarter in Düsseldorf !!! URGENT

in MySQL…

there is something wrong… I feel like in a DejaVu… I was writing PL/SQL for Oracle in 2005, and now back to this?

12.7 MySQL Compound-Statement Syntax :: 12.7.5 Cursors

Vodafone Wayfinder Open Source Software

http://oss.wayfinder.com/

Vodafone Demonstrates Commitment to Open Source Innovation

15 July 2010
Group Press Releases (2010)

mi sono stupito pure io…
visto che il nostro CTO, e meta’ del management, arriva da M$

trovate i sorci su GitHub.com

p.s. (giusto per fare chiarezza) hanno deciso di rilasciarlo dopo che hanno mandato a casa tutti gli sviluppatori e chiuso l’ufficio di Cambridge… NdR.

e piu’ mi innamoro del kernel

/** pcmcia_request_irq
 *
 * Request_irq() reserves an irq for this client.
 *
 * Also, since Linux only reserves irq's when they are actually
 * hooked, we don't guarantee that an irq will still be available
 * when the configuration is locked.  Now that I think about it,
 * there might be a way to fix this using a dummy handler.
 */

tratto da drivers/pcmcia/pcmcia_resource.c +709

k… ora capisco tutto l’astio che Ale ha per l’architettura x86…

questo e’ il pezzo di codice che mi sta dando problemi perche’ non gestisce gli IRQ condivisi… a volte devo dare ragione a Fuggetta che software libero non vuol dire per forza qualita’…

i = pcmcia_request_irq(link, &link->irq);
if (i != 0) {
	/* FIXME: comment does not fit, error handling does not fit */
	printk(KERN_NOTICE
	       "serial_cs: no usable port range found, giving up\n");
	link->irq.AssignedIRQ = 0;
}

…tratto dal drivers/serial/serial_cs.c +589