1,458 reputation
1917
bio website karol.piczak.com
location Warsaw, Poland
age 27
visits member for 4 years, 6 months
seen yesterday

One-liner: Finance/data tinkerer by day, hobbyist composer by night. Academically interested in AI/ML and machine perception (currently working on a PhD in sound classification with machine audition techniques).


Educational background: Master of Finance, now pursuing a PhD in Computer Science (audio data analysis, signal processing, music recommender systems, MIR etc.).

Professional interests:

  • Quantitative finance
  • Financial markets

Academic interests:

  • Machine perception, audio data analysis, music recommender systems, MIR, signal processing and identification, audio mining
  • Artificial intelligence, machine learning, data mining, statistical analysis

Personal interests:

  • Music composition and sound design
  • Foreign languages
  • Fantasy books

My business card: karol.piczak.com

My web presence: karol.dvl.pl


Jun
29
comment Is there any way to fix a corrupted LDM database?
Unfortunately not, no such service is available in this case (typical separated workstation). My searches did not reveal much either, presumably due to the semi-proprietary nature of the LDM standard. I think not much can be done in this case, but I thought posting here, though a long shot, is my last resort. For the time being, I'm happy that despite this malformed database, all the volumes get recognized by the system and are available for normal use. I hope it stays that way until a more permanent solution can be found (or the problem ceases to exist along with some hardware upgrade).
May
30
comment What is the simplest CMS for my needs?
It would fit webmasters.stackexchange.com better.
May
30
comment Should the database connection limit equal the number of processes connecting?
What kind of application do you have? How many database calls do you make and how long do they take, do you use persistent connections? It's hard to say without knowing the specifics. If you're not having some performance issues, then I think the default value is a safe starting point.
May
18
comment Why does FTP passive mode require a port range as opposed to only one port?
BTW, feel free to comment on missed points and inconsistencies here. Even myself, I feel as if I'm nitpicking on a simple answer - yes, you can. ;-)
Apr
27
comment Server slow response: ps aux shows many php5-fpm processes
You can have a look in bit.ly/2s0ILr and bit.ly/gKYpq1 and try profiling/caching a bit. Add to that some opcode caching (bit.ly/f5HITG) and you should be fine. As long as you can keep the generation time you have and serve unexpected guests inflow from cache there shouldn't be a real problem.
Apr
27
comment Server slow response: ps aux shows many php5-fpm processes
It seems indeed that your server is fine, and WordPress is your bottleneck. But I wouldn't call it awful. Just that it has some overhead. It's functional though. My WordPress blog has page generation times around 300ms, SilverStripe installation somewhere in 500ms range, and some simple sites on a streamlined in-house CMS get 100ms (all without caching). It's all a matter of how much processing/queries you do.
Apr
27
comment Server slow response: ps aux shows many php5-fpm processes
Ah, I phrased it wrong. I mean is this request time for the PHP generated page only or all CSS / JS requests too? And what times do you get for static HTML and some Hello World in PHP?
Apr
19
comment Do CNAME records overrule A records?
@Jeff, you're right. I think it's just a typo in the question, that's why I asked for verification.
Apr
19
comment Do CNAME records overrule A records?
To get it right, you mean you're gonna swap foo.com into being alias for www.foo.com, correct? The last example is a bit confusing. And as @Avery said, if you need 301, then that's not really DNS stuff.
Apr
9
comment Running php scripts from secure location
If you deny access to your scripts you won't be able to access them. That's what deny is for. Don't do it, and you should be fine. And now seriously, why do you need the scripts to be non-accessible?
Apr
7
comment How to give user permissions on ubuntu server?
Normally what you want is achieved by a chrooted SFTP only setup or some restricted shell like rssh. Do you have to stay with a less secure FTP setup?
Apr
6
comment Migrating a subdomain to a subdirectory, whilst running on a separate server
In that case it should work. Though I think it's not a very elegant and fail-proof solution, so you should weigh the consequences of such a setup in comparison to staying with a separate ecommerce subdomain.
Mar
7
comment SSH Connection Refused - Debug using Recovery Console
From what I get he's using a recovery distro, so basically full access to the filesystem while the original system is offline. Maybe I misinterpreted this part though: "but I do have access to the filesystem using a recovery console". Ole could clarify this.
Mar
7
comment SSH Connection Refused - Debug using Recovery Console
I suppose the asker has no access to interactive shell, right Ole? He would have to wrap this command in some dummy script run on system start and log the output.
Jun
3
comment wireless router on LAN
A side note here. Before plugging it in, see if it's OK with your IT staff/internal policies. Technically this shouldn't be a problem.
May
30
comment Why can't I get rid of default index.html even if I disable the default virtual host in Apache2?
Are you still seeing this issue? The config looks fine, and the address you gave seems OK too when browsed from my place.
May
21
comment mod_rewrite RewriteRule is not working
stackoverflow.com/questions/2875405/… seems like a correct response to me. What's wrong with it?
May
18
comment How can I avoid an error in this .htaccess file?
It still seems like a loop. And I'm still not sure I understand it right. Maybe it will be easier to talk about URLs, not files for a moment. Externally, would an article be available through www.monkey-robot.com/:year/:month/:day/:title/ or www.monkey-robot.com/blog/:year/:month/:day/:title/?
May
18
comment How can I avoid an error in this .htaccess file?
It's not clear either if you want only the root page rewritten (/blog/ to /) or everything under too? For instance, do you want to use /blog/archives/ or just /archives/?
May
13
comment setup dns to redirect all http requests on a specific machine in LAN
I think some transparent proxy could do in this case. Do you want to redirect every possible domain name this way, or some special subset you have? Failover to real Internet content when not available locally? And last thing - what operating system are we talking about?