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dev:mohlo_by_se_hodit [30.10.2013 16:34]
pitriss +vzdálenost
dev:mohlo_by_se_hodit [19.01.2015 20:23] (aktuální)
ritchie zalohovani db bez restartu mt serveru
Řádek 11: Řádek 11:
       * workshopy jsou změněny z LV na MV       * workshopy jsou změněny z LV na MV
   * [[http://wiki.minetest.com/wiki/Setting_up_a_server/Ubuntu|Jednoduchý návod na zprovoznění minetest serveru]], inspirace konfigurace složek ve skriptu.   * [[http://wiki.minetest.com/wiki/Setting_up_a_server/Ubuntu|Jednoduchý návod na zprovoznění minetest serveru]], inspirace konfigurace složek ve skriptu.
 +  * [[https://forum.minetest.net/viewtopic.php?id=2840|Nodebox Generator]] - program na tvorbu bloků různých tvarů
 +  * [[http://forum.root.cz/index.php?topic=7533.msg73935;topicseen#new|VPN a iptables]] ohledně default GW pro OpenVPN - jen pro záznam
  
 ==== jak zvětšit počet nodů ==== ==== jak zvětšit počet nodů ====
Řádek 31: Řádek 33:
 ==== Detekce vzdálenosti ==== ==== Detekce vzdálenosti ====
  
-[16:29:10] <pitriss> please did someone invented some quick way how to get distance of player from some spot on map? I don't want to re-invent a wheel:) +  [16:29:10] <pitriss> please did someone invented some quick way how to get distance of player from some spot on map? I don't want to re-invent a wheel:) 
-[16:29:49] <kaeza> huh? +  [16:30:34] <sfan5> pitriss: vector.distance 
-[16:30:33] <-- monkeycoder has left this server (Ping timeout: 245 seconds). +  [16:30:49] <kaeza> pitriss, pythagoras' theorem, or use vector.distance(p1, p2) 
-[16:30:34] <sfan5> pitriss: vector.distance +  [16:32:31] <pitriss> so vector.distance(coords1, coords2).. I guess coords are tables:) Thank you guys:) 
-[16:30:49] <kaeza> pitriss, pythagoras' theorem, or use vector.distance(p1, p2) +  [16:32:54] <pitriss> and sorry for my noobish questions..:) 
-[16:31:00] <-- OldCoder has left this server (Quit: Leaving). +  [16:33:00] <sfan5> tables like {x=1, y=0, z=7} 
-[16:32:31] <pitriss> so vector.distance(coords1, coords2).. I guess coords are tables:) Thank you guys:) + 
-[16:32:54] <pitriss> and sorry for my noobish questions..:) + 
-[16:32:58] <-- markveidemanis has left this server (Ping timeout: 240 seconds). +==== Definice max_lag ==== 
-[16:33:00] <sfan5> tables like {x=1, y=0, z=7}+<code text> 
 +[21:43] <ShadowNinja> Wouldn't max_lag be a better value to announce as lag than the step time? 
 +[21:44] <sapier> Can someone explain to me what max lag is supposed to be? 
 +[21:45] <PilzAdam> sapier, AFAIK its the time spend in Lua code 
 +[21:47] <ShadowNinja> sapier: http://pastebin.ubuntu.com/6845876/ 
 +[21:48] <ShadowNinja> Basically dtime that decreases only slowly. 
 +[21:49] <sapier1> hmm ok guess we need to think about this way of determine lag later as it doesn't honor network lag 
 +</code> 
 + 
 +[[http://pastebin.ubuntu.com/6845876/]] 
 +<code c> 
 +                float max_lag = m_env->getMaxLagEstimate(); 
 +                max_lag *= 0.9998; // Decrease slowly (about half per 5 minutes) 
 +                if(dtime > max_lag){ 
 +                        if(dtime > 0.1 && dtime > max_lag * 2.0) 
 +                                infostream<<"Server: Maximum lag peaked to "<<dtime 
 +                                                <<" s"<<std::endl; 
 +                        max_lag = dtime; 
 +                } 
 +                m_env->reportMaxLagEstimate(max_lag); 
 +</code> 
 + 
 +Další pěkné vysvětlení max_lag, by Zeno: https://forum.minetest.net/viewtopic.php?t=10884&p=167238#p167292 
 + 
 +>max_lag is kind of diffucult to explain. If you're interested in your **own** lag, RTT is the value you want to be looking at (not max_lag). 
 +
 +>What max_lag (very basically) is how long the server takes to process a single "server step" (i.e. update the environment, make new map blocks, reply to all clients... stuff like that). Let's call that server_step_time. Every time server_step_time is greater than twice the current max_lag then max_lag becomes that new server_step_time. 
 +
 +>Once the CPU processing spike goes away the max_lag decreases by .02% every server_step (unless it goes up again) until it again reaches the "normal" server_step time. This can take a while (maybe 5-10 minutes). So even if max_lag is showing, say, 5.6s the current server lag may be (and probably is) a lot less. 
 +
 +>Anyway, from a client perspective RTT is the value you should be looking at, and that's for your client only. The minimum value for RTT is at least server_step_time, so it *is* kind of associated with max_lag for a particular instant but because of the way max_lag is calculated and decreased slowly it's not very well correlated at all (unless max_lag is constant). 
 +
 +>Err, it's kind of complicated isn't it :/ max_lag is not really useful from a client's perspective at all because there is nothing the client can do about it. It's really more useful for people running a server and tuning server-side values. Even then, because max_lag is a weighted average (in effect) using a fixed value for the weight it's uses are (currently) limited (IMO) 
 + 
 +==== Zálohování DB bez restartu MT serveru ==== 
 + 
 +http://irc.minetest.ru/minetest/2015-01-19#i_4121156 
 + 
 +vitaminx: 
 +>btw. i just found a method to safely backup map.sqlite *without* stopping the server 
 +>create a file called "backup.sql" and put this inside: 
 +<code> 
 +begin immediate; 
 +.shell cp $HOME/.minetest/worlds/world/map.sqlite $HOME/map.sqlite_backup 
 +rollback; 
 +</code> 
 +>then tell your backup script to execute this line: 
 +<code> 
 +echo ".read backup.sql" | sqlite3 -echo .minetest/worlds/world/map.sqlite 
 +</code> 
 +>DB stays consistent and user stay logged in - they probably notice a short lag while the DB file is copied, thats all 
 +twoelk: 
 +>vitaminx: doesn't rollback freeze youre server? 
 +vitaminx: 
 +>it gets a lock on the DB, so minetest has to wait with it's writes - thats what I mean with short lag 
 +>i will test it today, lets see if its really noticeable 
 +>having a short lag is probably still better then to disconnect all players
  
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