Monday, 2016-07-18

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SfietKonstantinWping chriadam08:05
chriadampong08:06
SfietKonstantinWI was wondering08:06
SfietKonstantinWI'm building some benchmarks now08:06
SfietKonstantinWand I want to know what are the size of data that a "standard" query to qtcontacts weight08:07
SfietKonstantinWeh08:07
SfietKonstantinWthe question is: "what is the size of the contacts structure handled by qtcontacts"08:07
SfietKonstantinWso that I can emuylate it in a fake db and do some queries to benchmark08:07
chriadamwell, if you assume a contacts app showing a scrollable listview of contacts, where each page has... 20 contacts in view, and assuming it's flicked at 1 page per frame at 60 fps, then that's 60x20 contacts per second.  you probably want to perform queries to cache results for half a second on either side, so 30x20 contacts per request08:08
chriadam600 contacts.  let's say you need some specific subset of details (display name, nickname, name, phone number, email, avatar)08:09
chriadamthat's say... 14 fields08:09
chriadameach field we can approximate to say 20 bytes of data08:09
chriadamso.08:10
chriadam300 x 14 x 2008:10
SfietKonstantinWso08:10
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chriadamapprox 85k08:10
SfietKonstantinWselect * from <table containing 14 fields> limit 300 should be enough ?08:10
SfietKonstantinWand 85k ok08:10
chriadamI suspect a lot of overhead exists, but if you assume 150k per request, that seems more than reasonable08:11
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SfietKonstantinWOK08:11
SfietKonstantinWi'm gonna have some fun with that08:11
chriadamcool08:12
chriadaminterestingly, I rewrote the accounts framework (not released yet, still need to finish some of it) in pure Qt, and it uses the same core idea: daemon which processes dbus requests from clients, returns results over dbus (p2p)08:12
chriadamso no database activity is ever done by the client08:12
chriadamI (as yet) haven't done any access control, really (so that's something which can be plugged in later)08:13
chriadambut certainly for accounts the throughput was totally fine08:13
chriadamof course, contacts is much more data intensive.08:13
SfietKonstantinWhey08:13
SfietKonstantinWthat can be interesting08:13
SfietKonstantinWespecially if you want to add an authority daemon that gives access (or not) to accounts08:14
chriadamyeah, not sure about security aspects yet, we still need to think about that more.08:14
SfietKonstantinWwell08:14
SfietKonstantinWit is still something08:14
SfietKonstantinWhowever, SELinux would be welcomed as well08:14
chriadamdefinitely08:15
chriadambut that's a discussion for another day ;-)08:15
* chriadam heads home - good luck with the prototyping08:15
SfietKonstantinW:)08:21
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