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  • What would cause different rates of packet loss between client and server in UDP?

    - by febreezey
    If I've implemented a reliable UDP file transfer protocol and I have a file that deliberately drops a percentage of packets when I transmit, why would it be more evident that transmission time increases as the packet loss percentage increases going from the client to server as opposed from the server to the client? Is this something that can be explained as a result of the protocol? Here are my numbers from two separate experiments. I kept the max packet size to 500 Bytes and the opposite direction packet loss to 5% with a 1 Megabyte file: Server to Client loss Percentage varied: 1 MB file, 500 b segments, client to server loss 5% 1% : 17253 ms 3% : 3388 ms 5% : 7252 ms 10% : 6229 ms 11% : 12346 ms 13% : 11282 ms 15% : 9252 ms 20% : 11266 ms Client to Server loss percentage varied 1 MB file, 500 b segments, server to client loss 5% 1%: 4227 ms 3%: 4334 ms 5%: 3308 ms 10%: 31350 ms 11%: 36398 ms 13%: 48436 ms 15%: 65475 ms 20%: 120515 ms You can clearly see an exponential increase in the client to server group

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  • Lighttpd with FastCGI won't create /tmp/fcgi.sock on startup?

    - by Marlon
    I'm running lighttpd-1.4.19 on a debian 5 box and try to run web2py with fastcgi. The problem with that is, that lighttpd does not create the socket file /tmp/fcgi.sock. If I'm creating the file by myself touch /tmp/fcgi.sock lighttpd will start but will throw this error after some time running: unexpected end-of-file (perhaps the fastcgi process died): pid: 0 socket: unix:/tmp/fcgi.sock My config looks like this: fastcgi.server = ( "/handler_web2py.fcgi" = ( "handler_web2py" = ( #name for logs "check-local" = "disable", "socket" = "/tmp/fcgi.sock", "idle-timeout" = 20, "max-procs" = 1 ) ), ) Is there any known problem with running lighttpd on debian 5? Thanks for any help. I have pasted the whole lighttpd config: http://pastie.org/1660646

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  • How do I get the last value of a column in an Excel spreadsheet?

    - by Chris
    In column A, I have dates. In column B, I have my body weight logged for the day. I add one row to each every day when I weigh myself, so this means the data is sorted by date ascending. The weights, of course, fluctuate (though it would be nice if they would go down every day for my own personal benefit). For a couple of calculations, I want to get the latest (or last) weight entered in column B. Not the max or the min, but the last one entered in the column. I want it to work no many how many rows I enter. I use Excel 2007, if that ends up mattering.

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  • MD3200i Slow Performance and Queue Depth

    - by Caleb_S
    Read performance on our SAN is slow under certain workloads. When we compare this to some local storage, we find the local storage performing 2x as fast. The SAN performs well with a high Queue Depth, and poorly with a low queue depth. However, the local storage performs well with a low Queue Depth. I'd like to know the reason for this occurring and find out what the specific limiting factor is in this situation. MD3200i iSCSI SAN ($15,000) 6 x 600GB 15k SAS RAID5 6 x 2TB 7.2k NLS RAID5 XCOPY /j Benchmark: (Slow) 15k Array - 71MB/s (Queue Depth 1) 7.2k Array- 71MB/s (Queue Depth 1) Robycopy /MT:32 Benchmark: (Fast) 15k Array - 171MB/s (Queue Depth ~12) 7.2k Array- 128MB/s (Queue Depth ~12) , , Read Performance on a Local controller is fast under the workload the SAN is slow at. , HighPoint 2230 RAID Controller ($600) 4 x 1TB 7.2k SATA RAID5 XCOPY /j Benchmark: 7.2k Array - 145MB/s (Queue Depth 1) (appears to max out the SATA bus)

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  • Apache2 + FCGI + PHP5 not creating sockets / pools

    - by CodyRo
    I have a pretty vanilla setup with Apache2, FastCGI setup as DSO and serving PHP through an external CGI script that sets the max children / serves the request to PHP. The issue is FastCGI doesn't appear to be creating the PHP sockets / pooling them so each request calls the php-cgi binary, then dies off .. effectively making the reason I want to use FastCGI moot. The only configuration directives I have are: AddHandler php5-fastcgi .php Action php5-fastcgi /cgi-bin/fcgi.cgi FastCgiIpcDir /usr/local/apache2/fastcgi The dyanmic/ directory is getting created as anticipated, but there are no sockets in there. Permissions are indeed correct. Any help would be greatly appreciated, thanks!

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  • nginx status code 200 and 304

    - by Chamnap
    I'm using nginx + passenger. I'm trying to understand the nginx response 200 and 304. What does this both means? Sometimes, it responses back in 304 and others only 200. Reading the YUI blog, it seems browser needs the header "Last-Modified" to verify with the server. I'm wondering why the browser need to verify the last modified date. Here is my nginx configuration: location / { root /var/www/placexpert/public; # <--- be sure to point to 'public'! passenger_enabled on; rack_env development; passenger_use_global_queue on; if ($request_filename ~* ^.+\.(jpg|jpeg|gif|png|ico|css|js|swf)$) { expires max; break; } } How would I add the header "Last-Modified" to the static files? Which value should I set?

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  • haproxy access list using path_dir having issues with firefox

    - by user11243
    I'm trying to route all requests containing a path directory of /socket.io/ to a separate port with HAProxy. Here is my config file: global maxconn 4096 # Total Max Connections. This is dependent on ulimit nbproc 2 defaults mode http frontend all 0.0.0.0:80 timeout client 86400000 default_backend web_servers acl is_stream path_dir socket.io use_backend stream_servers if is_stream backend web_servers balance roundrobin option forwardfor # This sets X-Forwarded-For timeout server 30000 timeout connect 4000 server web1 127.0.0.1:4000 weight 1 maxconn 1024 check backend stream_servers balance roundrobin option forwardfor # This sets X-Forwarded-For timeout queue 5000 timeout server 86400000 timeout connect 86400000 server stream1 127.0.0.1:5100 weight 1 maxconn 1024 check URL paths with a /socket.io/ get correctly directed to port 5100 in chrome and safari. However not for firefox. I'm running Haproxy locally on my mac for dev, not sure if it has anything to do with it. I'm using haproxy 1.4.8 and Firefox 3.6.15. I've tried clearing cache on firefox and it didn't help, so I'm thinking there's something wrong with the way HAProxy parses through the Firefox request headers.

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  • Connection Reset by Peer error with Apache and JBoss 7.1.1

    - by vikingz
    We are seeing errors on some of our QA testing scripts that intermittently throw Connection Reset By Peer errors. The Test scripts submit requests via F5 which forwards requests to Apache (2.2.21) with a mod_jk load_balancer with the following setting for each worker in the worker.property worker1 props worker.worker1.type=ajp13 worker.worker1.port=8109 worker.worker1.lbfactor=1 worker.worker1.host=skunkhost1.com worker.worker1.connection_pool_timeout=30 and here is what is in the JBoss domain.xml for the AJP port from JBoss 7.1.1 <unbounded-queue-thread-pool name="SKUNKY.APP.AJP"> <max-threads count="300"/> <keepalive-time time="3" unit="minutes"/> </unbounded-queue-thread-pool> Here is httpd.conf Timeout 300 KeepAlive On KeepAliveTimeout 15 MaxKeepAliveRequests 100 TraceEnable Off My question is that is it posisbe that apache times out and closes the connection while jboss is still ready and working on the request? What might be causing the Connection Reset By Peer error?what am i missing here? Any help is majorly appreciated!! Sincerely KK

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  • log-back and thirdparty writing to stdout. How to stop them getting interleaved.

    - by David Roussel
    First some background. I have a batch-type java process run from a DOS batch script. All the java logging goes to stdout, and the batch script redirects the stdout to a file. (This is good for me because I can ECHO from the script and it gets into the log file, so I can see all the java JVM command line args, which is great for debugging.) I may not I use slf4j API, and for the backend I used to use log4j, but recently switched to logback-classic. Although all my application code uses slf4j, I have a third party library that does it's own logging (not using a standard API) which also gets written to stdout. The problem is that sometimes log lines get mixed up and don't cleanly appear on separate lines. Here is an example of some messed up output: 2010-05-28 18:00:44.783 [thread-1 ] INFO CreditCorrelationElementBuilderImpl - Bump parameters exist for scenario, now attempting bumping. [indexDisplayName=STANDARD_S1_v300] 2010-05-28 18:01:43.517 [thread-1 ] INFO CreditCorrelationElementBuilderImpl - Found adjusted point in data, now applying bump. [point=0.144040000000000] 2010-05-28 18:01:58.642 [thread-1 ] DEBUG com.company.request.Request - Generated request for [dealName=XXX_20050225_01[5],dealType=GENERIC_XXX,correlationType=2,copulaType=1] in 73.8 s, Simon Stopwatch: [sys1.batchpricer.reqgen.gen INHERIT] total 1049 s, counter 24, max 74.1 s, min 212 ms 2010-05-28 18:05/28/10 18:02:20.236 INFO: [ServiceEvent] SubmittedTask:BC-STRESS_04_FZBC-2010-05-21-545024448189310126-23 01:58.658 [req-writer-2b ] INFO .c.g.r.o.OptionalFileDocumentOutput - Writing request XML to \\filserver\dir\file1.xml - write time: 21.4 ms - Simon Stopwatch: [sys1.batchpricer.reqgen.writeinputfile INHERIT] total 905 ms, counter 24, max 109 ms, min 10.8 ms 2010-05-28 18:02:33.626 [ResponseCallbacks-1: DriverJobSpace$TakeJobRunner$1] ERROR c.c.s.s.D.CalculatorCallback - Id:23 no deal found !! 2010-0505/28/10 18:02:50.267 INFO: [ServiceEvent] CompletedTask:BC-STRESS_04_FZBC-2010-05-21-545024448189310126-23:Total:24 Now comparing back to older log files, it seems the problem didn't occur when using log4j as the logging backend. So logback must be doing something different. The problem seems to be that although PrintStream.write(byte buf[], int off, int len) is synchronized, however I can see in ch.qos.logback.core.joran.spi.ConsoleTarget that System.out.write(int b) is the only write method called. So inbetween logback outputting each byte, the thirdparty library is managing to write a whole string to the stdout. (Not only is this cause me a problem, but it must also be a little inefficient?) Is there any other fix to this interleaving problem than patching the code to ConsoleTarget so it implments the other write methods? Any nice work arounds. Or should I just file a bug report? Here is my logback.xml: <configuration> <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> <encoder> <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%-16thread] %-5level %-35.35logger{30} - %msg%n</pattern> </encoder> </appender> <root level="DEBUG"> <appender-ref ref="STDOUT" /> </root> </configuration> I'm using logback 0.9.20 with java 1.6.0_07.

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  • Windows 7 Green Load Bar Stuck and never finish loading,

    - by Levan
    Here is my issues, which i am currently having, in my windows 7, When i go to one specific folder, .Please take a look, This is not my file, but just to get an idea, there is 10 file max no more than 500 MB, i am not able to remove it, or cut it, or move it, it starts that green bar loading and never finish, The problem is, after getting into this folder, my SONY VAIO starts, overheating and if i did not restart, nothing can stop it to be cool down . I have reinstalled windows 2 weeks ago, i don't think this should be issue regarding it. Please, help me what the hell i should do with this GREEN BAR< to stop this headache,

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  • sql perfomance on new server

    - by Rapunzo
    My database is running on a pc (AMD Phenom x6, intel ssd disk, 8GB DDR3 RAM and windows 7 OS + sql server 2008 R2 sp3 ) and it started working hard, timeout problems and up to 30 seconds long queries after 200 mb of database And I also have an old server pc (IBM x-series 266: 72*3 15k rpm scsi discs with raid5, 4 gb ram and windows server 2003 + sql server 2008 R2 sp3 ) and same query start to give results in 100 seconds.. I tried query analyser tool for tuning my indexed. but not so much improvements. its a big dissapointment for me. because I thought even its an old server pc it should be more powerfull with 15k rpm discs with raid5. what should I do. do I need $10.000 new server to get a good performance for my sql server? cant I use that IBM server? Extra information: there is 50 sql users and its an ERP program. There is my query ALTER FUNCTION [dbo].[fnDispoTerbiye] ( ) RETURNS TABLE AS RETURN ( SELECT MD.dispoNo, SV.sevkNo, M1.musteriAdi AS musteri, SD.tipTurId, TT.tipTur, SD.tipNo, SD.desenNo, SD.varyantNo, SUM(T.topMetre) AS toplamSevkMetre, MD.dispoMetresi, DT.gelisMetresi, ISNULL(DT.fire, 0) AS fire, SV.sevkTarihi, DT.gelisTarihi, SP.mamulTermin, SD.miktar AS siparisMiktari, M.musteriAdi AS boyahane, MD.akisNotu AS islemler, --dbo.fnAkisIslemleri(MD.dispoNo) DT.partiNo, DT.iplikBoyaId, B.tanimAd AS BoyaTuru, MAX(HD.hamEn) AS hamEn, MAX(HD.hamGramaj) AS hamGramaj, TS.mamulEn, TS.mamulGramaj, DT.atkiCekmesi, DT.cozguCekmesi, DT.fiyat, DV.dovizCins, DT.dovizId, (SELECT CASE WHEN DT.dovizId = 2 THEN CAST(round(SUM(T .topMetre) * DT.fiyat * (SELECT TOP 1 satis FROM tblKur WHERE dovizId = 2 ORDER BY tarih DESC), 2) AS numeric(18, 2)) WHEN DT.dovizId = 3 THEN CAST(round(SUM(T .topMetre) * DT.fiyat * (SELECT TOP 1 satis FROM tblKur WHERE dovizId = 3 ORDER BY tarih DESC), 2) AS numeric(18, 2)) WHEN DT.dovizId = 1 THEN CAST(round(SUM(T .topMetre) * DT.fiyat * (SELECT TOP 1 satis FROM tblKur WHERE dovizId = 1 ORDER BY tarih DESC), 2) AS numeric(18, 2)) END AS Expr1) AS ToplamTLfiyat, DT.aciklama, MD.dispoNotu, SD.siparisId, SD.siparisDetayId, DT.sqlUserName, DT.kayitTarihi, O.orguAd, 'Çözgü=(' + (SELECT dbo.fnTipIplikler(SD.tipTurId, SD.tipNo, SD.desenNo, SD.varyantNo, 1) AS Expr1) + ')' + ' Atki=(' + (SELECT dbo.fnTipIplikler(SD.tipTurId, SD.tipNo, SD.desenNo, SD.varyantNo, 2) AS Expr1) + ')' AS iplikAciklama, DT.prosesOk, dbo.[fnYikamaTalimat](SP.siparisId) yikamaTalimati FROM tblDoviz AS DV WITH(NOLOCK) INNER JOIN tblDispoTerbiye AS DT WITH(NOLOCK) INNER JOIN tblTanimlar AS B WITH(NOLOCK) ON DT.iplikBoyaId = B.tanimId AND B.tanimTurId = 2 ON DV.id = DT.dovizId RIGHT OUTER JOIN tblMusteri AS M1 WITH(NOLOCK) INNER JOIN tblSiparisDetay AS SD WITH(NOLOCK) INNER JOIN tblDispo AS MD WITH(NOLOCK) ON SD.siparisDetayId = MD.siparisDetayId INNER JOIN tblTipTur AS TT WITH(NOLOCK) ON SD.tipTurId = TT.tipTurId INNER JOIN tblSiparis AS SP WITH(NOLOCK) ON SD.siparisId = SP.siparisId ON M1.musteriNo = SP.musteriNo INNER JOIN tblTip AS TP WITH(NOLOCK) ON SD.tipTurId = TP.tipTurId AND SD.tipNo = TP.tipNo AND SD.desenNo = TP.desen AND SD.varyantNo = TP.varyant INNER JOIN tblOrgu AS O WITH(NOLOCK) ON TP.orguId = O.orguId INNER JOIN tblMusteri AS M WITH(NOLOCK) INNER JOIN tblSevkiyat AS SV WITH(NOLOCK) ON M.musteriNo = SV.musteriNo INNER JOIN tblSevkDetay AS SVD WITH(NOLOCK) ON SV.sevkNo = SVD.sevkNo ON MD.mamulDispoHamSevkno = SV.sevkNo LEFT OUTER JOIN tblTop AS T WITH(NOLOCK) INNER JOIN tblDispo AS HD WITH(NOLOCK) ON T.dispoNo = HD.dispoNo AND T.dispoTuruId = HD.dispoTuruId ON SVD.dispoTuruId = T.dispoTuruId AND SVD.dispoNo = T.dispoNo AND SVD.topNo = T.topNo AND MD.siparisDetayId = HD.siparisDetayId ON DT.dispoTuruId = MD.dispoTuruId AND DT.dispoNo = MD.dispoNo LEFT OUTER JOIN tblDispoTerbiyeTest AS TS WITH(NOLOCK) ON DT.dispoTuruId = TS.dispoTuruId AND DT.dispoNo = TS.dispoNo --WHERE DT.gelisTarihi IS NULL -- OR DT.gelisTarihi > GETDATE()-30 GROUP BY MD.dispoNo, DT.partiNo, DT.iplikBoyaId, TS.mamulEn, TS.mamulGramaj, DT.gelisMetresi, DT.gelisTarihi, DT.atkiCekmesi, DT.cozguCekmesi, DT.fire, DT.fiyat, DT.aciklama, DT.sqlUserName, DT.kayitTarihi, SD.tipTurId, TT.tipTur, SD.tipNo, SD.desenNo, SD.varyantNo, SD.siparisId, SD.siparisDetayId, B.tanimAd, M.musteriAdi, M.musteriAdi, M1.musteriAdi, O.orguAd, TP.iplikAciklama, SD.miktar, MD.dispoNotu, SP.mamulTermin, DT.dovizId, DV.dovizCins, MD.dispoMetresi, MD.akisNotu, SV.sevkNo, SV.sevkTarihi, DT.prosesOk,SP.siparisId )

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  • ffmpeg encoding on QuadCore

    - by Gotys
    I am trying to push my server's CPU cores to the max, but no success. Encoding 2-pass style, set my "-threads" to 128 . When running 2nd pass , the CPU seems to be at 98% usage, but first pass run totally ignores "-threads" option. Using libx264 . Here is my preset: flags=+loop+mv4 cmp=256 partitions=+parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 me_method=hex subq=7 trellis=1 refs=5 bf=3 flags2=+bpyramid+wpred+mixed_refs+dct8x8 coder=1 me_range=16 g=250 keyint_min=25 sc_threshold=40 i_qfactor=0.71 qmin=10 qmax=51 qdiff=4 Is there any reason why the 1st pass is not utilizing my CPUs ? Thank you in advance! This community has always been very kind to me.

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  • ffmpeg encoding on QuadCore

    - by Gotys
    I am trying to push my server's CPU cores to the max, but no success. Encoding 2-pass style, set my "-threads" to 128 . When running 2nd pass , the CPU seems to be at 98% usage, but first pass run totally ignores "-threads" option. Using libx264 . Here is my preset: flags=+loop+mv4 cmp=256 partitions=+parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 me_method=hex subq=7 trellis=1 refs=5 bf=3 flags2=+bpyramid+wpred+mixed_refs+dct8x8 coder=1 me_range=16 g=250 keyint_min=25 sc_threshold=40 i_qfactor=0.71 qmin=10 qmax=51 qdiff=4 Is there any reason why the 1st pass is not utilizing my CPUs ? Thank you in advance! This community has always been very kind to me.

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  • Slider Position

    - by RobinHood
    I had used this code for to create a slider. It's working fine. I want to place the slider next to my label control. Like this (Slidder : Slidder Bar) How to do that? <div> <tr> <td class="aln-rht"> <asp:Label ID="Literal4" runat="server" Text="Slidder :" Font-Bold="true" /> </td> <td> <%=Html.DropDownList("Scale", null, "--Select Scale--", new { id = "speed1" , Style = "display:none"})%> </td> </tr> </div> <script type="text/javascript"> $(function () { var abc = $('select#speed1').selectToUISlider().next(); fixToolTipColor(); }); function fixToolTipColor() { $('.ui-tooltip-pointer-down-inner').each(function () { var bWidth = $('.ui-tooltip-pointer-down-inner').css('borderTopWidth'); var bColor = $(this).parents('.ui-slider-tooltip').css('backgroundColor') $(this).css('border-top', bWidth + ' Solid ' + bColor); }); } </script> The ui.slider.extras.css, selectToUISlider.JQuery.js and ui.slider.js files I had used This is JQuery-ui-1.7.1.custom.css, which i am using... .ui-slider { position: relative; text-align: left; } .ui-slider .ui-slider-handle { position: absolute; z-index: 2; width: 1.2em; height: 1.2em; cursor: default; border-color: Maroon; background-color: Olive} .ui-slider .ui-slider-range { position: absolute; z-index: 1; font-size: .7em; display: block; border: 0; } .ui-slider-horizontal { height: .8em; border-color: Olive;} .ui-slider-horizontal .ui-slider-handle { top: -.3em; margin-left: -.6em; } .ui-slider-horizontal .ui-slider-range { top: 0; height: 100%; } .ui-slider-horizontal .ui-slider-range-min { left: 0; } .ui-slider-horizontal .ui-slider-range-max { right: 0; } .ui-slider-vertical { width: .8em; height: 100px; border-color: Olive; } .ui-slider-vertical .ui-slider-handle { left: -.3em; margin-left: 0; margin-bottom: -.6em; } .ui-slider-vertical .ui-slider-range { left: 0; width: 100%; } .ui-slider-vertical .ui-slider-range-min { bottom: 0; } .ui-slider-vertical .ui-slider-range-max { top: 0; }/* Tabs

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  • How to Script a backup for each database on an MSSQL Engine?

    - by Geo
    We need to backup 40 databases inside an MS SQL Server Engine. We backup each database with the following script: BACKUP DATABASE [dbname1] TO DISK = N'J:\SQLBACKUPS\dbname1.bak' WITH NOFORMAT, INIT, NAME = N'dbname1-Full Database Backup', SKIP, NOREWIND, NOUNLOAD, STATS = 10 GO declare @backupSetId as int select @backupSetId = position from msdb..backupset where database_name=N'dbname1' and backup_set_id=(select max(backup_set_id) from msdb..backupset where database_name=N'dbname1' ) if @backupSetId is null begin raiserror(N'Verify failed. Backup information for database ''dbname1'' not found.', 16, 1) end RESTORE VERIFYONLY FROM DISK = N'J:\SQLBACKUPS\dbname1.bak' WITH FILE = @backupSetId, NOUNLOAD, NOREWIND GO We will like to add to the script the functionality of taking each database and replacing it in the above script. Basically a script that will create and verify each database backup from an engine. I am looking for something like this: For each database in database-list sp_backup(database) // this is the call to the script above. End For any ideas?

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  • Squid Proxy Server: limit total bandwidth

    - by Pitto
    Hello my dear friends! We have a marvellous squid proxy with dansguardian for filetering and they both work just great. Is there any easy way to limit the total bandwidth usage? I'd like to set the max amount of squid users internet use to 1200 since our total band is 2000 and I need the rest to ensure other services such as voip to work without hiccups related to huge downloads on the "internet side" of our connection and similar issues. I mean a total squid bandwidth limitation and not a user-based. Fair thanks to everybody.

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  • Using MRTG's threshold feature to execute a php script

    - by Dan Fried
    I've set up mrtg using the online manual and the only online tutorial I found on the subject of thresholds, and the threshold just isn't firing. In my mrtg.cfg file, the relevant lines are ThreshDir: /path/to/mrtg/thresh ThreshMaxI[performance]: 1 ThreshMaxO[performance]: 1 ThreshProgI[performance]: /path/to/mrtg/scripts/alert.php ThreshProgO[performance]: /path/to/mrtg/scripts/alert.php The paths are right, because if I enter the paths wrong I get an error on executing mrtg. websitePerformance checks how long it takes to download the homepage, in milliseconds, so it should be exceeding the max every time. Alert.php is working fine when invoked directly from the shell, and when I point to a nonexistent script it tells me the script is not executable. No error messages are being generated, that I can find. The thresh directory is always empty. Why isn't the threshold being triggered by results that are greater than 1? Anyone have any suggestions?

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  • Determine Server specs for a Rails with MySQL database (on AWS)

    - by Rogier
    I developed a intranet applications with Rails (3.2) for one of my customers. There will be around 30-40 employees working with it. Backend is MySQL (5). What would be the best way to determine the servers specs needed? Given: max. load will be roughly 2400 (40*60) HTTP requests (mixed GET / POST) per hour. 15% of these calls are JSON calls (iOS) avg request will make between 5-10 database calls 500-800 SQL INSERTS per day webpages are fairly simple (no images, just text) avg webpage is 15 request (css/js/etc) and total size is 35-45 KB More specific, since they need access from multiple geographical locations, we are thinking of running a bitnami Ruby stack in the AWS cloud (uptime is important). Any thoughts on a AWS Instance (small/medium) and Utilization (light/medium/heavy) ? Thanks!

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  • Best practices for setting lm-factor in Squid refresh patterns

    - by Mpentecost
    I am running a Squid (3.1) cache in front of Django. The content of the site does not change very often, so Squid gives our backend much needed breathing room. Currently, this is the refresh pattern that we are using to cache the content: refresh_pattern . 60 100% 60 We basically want to cache everything for at least an hour (and only an hour) before Squid then re-validates the content. My question is on the "100%" parameter, which sets the lm-factor. I'm not sure if setting that to 100% is doing what we want it to. The assumption was that by setting it to 100%, it would ensure that objects stay in the cache for the max cache time. Is this an incorrect assumption? What are the best practices that one should follow when setting up a refresh pattern like this?

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  • University Assignment: Datacenter/Networking Infrastructure for Hosting Company [closed]

    - by TCB13
    My university assigned me to theorizing a data center for an Web Hosting company. The company should provide the following services: Shared WebHosting; Dedicated Servers; VPS (Virtual Private Server); The bandwith (as resquested) is limited to 10 Gbps. Is there any good book / other info I can read (max 100 pages) about how to design a good data center for hosting, what are the best practices and what should be done from a (logical) network perspective, what security policies should be implemented and how the data center should be built (physically)? Thank you ;)

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  • OpenOffice Calc - Highlighting the higest value in a column

    - by cornjuliox
    So I've got this spreadsheet open using OpenOffice Calc (ver 3.3.0) and its set up a little like this: A B C D 1.name quantity price total 2.foo 10 10 100 3.bar 20 6 120 4.red 30 7 210 Each cell in the "total" column is obtained by multiplying the two cells to the left of it, and what I'm trying to do is to get it so that Calc highlights the highest value in the total column (even better if it could highlight the entire row). I've tried using MAX(D1:D4) in the Conditional Formatting section, but it highlights multiple values. How do I get it to highlight just the highest value?

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  • Nginx Cache-Control

    - by optixx
    Iam serving my static content with ngnix. location /static { alias /opt/static/blog/; access_log off; etags on; etag_hash on; etag_hash_method md5; expires 1d; add_header Pragma "public"; add_header Cache-Control "public, must-revalidate, proxy-revalidate"; } The resulting header looks like this: Cache-Control:public, must-revalidate, proxy-revalidate Cache-Control:max-age=86400 Connection:close Content-Encoding:gzip Content-Type:application/x-javascript; charset=utf-8 Date:Tue, 11 Sep 2012 08:39:05 GMT Etag:e2266fb151337fc1996218fafcf3bcee Expires:Wed, 12 Sep 2012 08:39:05 GMT Last-Modified:Tue, 11 Sep 2012 06:22:41 GMT Pragma:public Server:nginx/1.2.2 Transfer-Encoding:chunked Vary:Accept-Encoding Why is nginx sending 2 Cache-Control entries, could this be a problem for the clients?

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  • Mikrotik queues and limiting total upstream bandwidth

    - by g18c
    With a Mikrotik router (form of embedded Linux) I have created simple queues per machine matched by source IP address. Each of the 4 machine queues has an unlimited burst 3Mbps/3Mbps for Tx/Rx. During speedtest.net on all 4 machines at the same time, each machine shows 3Mbps (and is limited correctly there), however the total bandwidth on the uplink goes to 12Mbps (i need to set this to 10Mbps max for the upstream). I want to restrict the actual traffic passing across the uplink port to 10Mbps regardless of what the other queues are doing (I need this catch all queue to have the final say on the uplink speed). For example I need: Scenario A Machine A transferring @ 3Mbps Machine B transferring @ 3Mbps Machine C transferring @ 3Mbps Machine D transferring @ 0Mbps Up-link speed = 9Mbps Scenario B Machine A trying to transfer @ 3Mbps Machine B trying to transfer @ 3Mbps Machine C trying to transfer @ 3Mbps Machine D trying to transfer @ 3Mbps Up-link speed = 10Mbps Actual transfer speed of machine A,B,C,D = 2.5Mbps This is to allow slight over subscription of bandwidth queues as not all will be transmitting at 3Mbps all the time. Is this possible and if so how would one go about doing this?

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  • TFTP PUT Failing Across Hosts

    - by Jason
    I have a TFTP server installed on a CentOS host. /etc/xinetd.d/tftp: service tftp { disable = no socket_type = dgram protocol = udp wait = yes user = root server = /usr/sbin/in.tftpd server_args = -c -s /var/lib/tftpboot per_source = 11 cps = 100 2 flags = IPv4 } If I try to PUT a file from a remote host to the host running the TFTP server, I get Transfer Timed Out - however, it does create the file in /var/lib/tftpboot but the file is empty. If I tftp from the tftp server to itself (localhost) and PUT a file, it works fine. I have verified that SELinux is disabled and IPTables are turned off. I can connect from the remote hosts with no issue - just seems to be the PUT I have issue with: [root@SVR01 TEST]# tftp 10.100.2.15 tftp> status Connected to 10.100.2.15. Mode: netascii Verbose: off Tracing: off Literal: off Rexmt-interval: 5 seconds, Max-timeout: 25 seconds tftp>

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  • Service haproxy error

    - by user128296
    I want to configure Haproxy for outgoing mail load balancing. my configuration file /etc/haproxy.cfg is. global maxconn 4096 # Total Max Connections. This is dependent on ulimit daemon nbproc 4 # Number of processing cores. Dual Dual-core Opteron is 4 cores for example. defaults mode tcp listen smtp_proxy 199.83.95.71:25 mode tcp option tcplog balance roundrobin # Load Balancing algorithm ## Define your servers to balance server r23.lbsmtp.org 74.117.x.x:25 weight 1 maxconn 512 check server r15.lbsmtp.org 199.71.x.x:25 weight 1 maxconn 512 check And when i start service haproxy i get this error. Starting HAproxy: [ALERT] 244/172148 (7354) : cannot bind socket for proxy smtp_proxy. Aborting. Please tell me where i am doing mistake.help will appreciated.

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