[revServer] process timeout issue
jerry.daniels at me.com
Tue Aug 3 09:37:08 CDT 2010
I have to say, I love your attitude, helpfulness and person. It seems that Rodeo would make an excellent case study for fixing and diagnosing revServer. However, actual experience right here in this thread tells you otherwise.
Our decisions about using a technology are not just about technology itself. They are about business, money, time and people as well.
I think the Rodeo team has made good decisions so far. Why? We've met and exceeded our publicized milestones. We've also hit our revenue/subscription goals today--four weeks early. That means a lot of people agree with our decisions.
This thread has repeatedly gone from the revServer timeout issue to personalities, Rodeo and its choice of technologies. And my attempts at humor (to get folks to lighten up) actually had the opposite effect.
We will not be answering direct, indirect, implied or other questions about Rodeo here on this list.
We've gotten a new site to deliver the intellectual property Daniels & Mara has created. It has better threaded discussions, mail notifications, etc., so there's no reason to use this list to discuss Rodeo-related matters.
Here's the place:
On Aug 3, 2010, at 8:47 AM, Andre Garzia wrote:
> I never seen a RevServer bug like those timeouts and stuff and of course
> Jerry is not making it up, so the logical conclusion is that there's some
> specific case(s) where a RevServer script can go loco and fail.
> After that conclusion, our first requirement is to draw a mental map of what
> is involved. Now repeat after me SETUP
> S - Scenario (what are they building)
> E - Environment (what is the surrounding environment)
> T - Technology (what are they using)
> U - Usage Case (what happened/when happened)
> P - Possible Points of Failure (critical things that need assessment)
> === Scenario ===
> Jerry, Sarah and Mary are building some amazing tools. They have a new
> development tool that is powered by new xTalk like language called LIST.
> Their system works by doing conversions on that LIST language to present
> and a round trip to the server is needed to execute LIST ACTIONS (is this
> === Environment ===
> Rodeo server was a RevServer built solution hosted at a datacenter. Is it
> hosted at On-Rev or is it hosted privatelly? Where is it hosted?
> === Technology ===
> Is Rodeo on virtualized hardware? Shared accounts? VPS? Which database was
> used? Is it being served with Apache?
> === Usage Case ===
> Can RevServer timeout be narrowed to some usage scenario? For example did it
> happened while huge conversions of LIST were taking place? Did it happen
> while complex database calls were being executed? Was it completelly random?
> === Possible Points of Failure ===
> If RevServer failed for a SANE REASON, meaning, it didn't simply exploded
> out of nowhere then the most probable causes are:
> * Memory Exaustion: RevServer script took more than it was allowed to chew
> and was terminated.
> * CPU Thief: RevServer script decided that the CPU was his alone and maxed
> it for more time than allowed. Terminated with prejudice.
> * Timeout: RevServer script started ponderating on the meaning of life while
> doing its chores, takes forever, terminated by virtualization police.
> These are the sane reasons for a process to be terminated by the system.
> Could it be that RevServer is crashing, crashing is not the same as being
> terminated. Being terminated means that you are working correctly but for
> some reason or policy your process is terminated, crashing means somewhere
> inside RevServer engine something went nuts and it died.
> Now we don't know the answers to those questions but those are questions
> that all should ask while facing problems with server side stuff. Server
> side is hard and while on the Desktop is OK to make a little standalone that
> allocated half a gig of memory, at the server side there's a big change that
> you will not be allowed to do that.
> There are to many possible points of failures and things to keep attention
> specially when you are building something as big as Rodeo. I am sure that
> Jerry and Sarah investigated their possibilities and reasoned what to do. In
> the end it is just a compromise about where you want to stop and work. They
> decided to move that technology to other engine. It is OK. Had they decided
> otherwise it would be OK too.
> Yesterday me and Pierre did some stress testing on his site. I've run 25
> concurrent access for 30 secs on his site, of course I've run it from a
> single machine and thus it is not the best benchmark possible but I did this
> multiple times and his did it at the same time as well and maybe others did
> to. On my tests there was not a single error. Some requests took longer
> thant others but this can happen for many resons including problems on my
> machine and network, after all I am on a lousy VPN.
> I am now building some huge RevServer based solutions and I am yet to face
> those problems, thats why I believe there's a recipe for them or that they
> are caused by a combination of factors related to the virtualization stack
> (if the server was indeed virtualized). Remember folks, virtualization is
> cool but nothing beats a real machine.
> Sorry for the long post
> http://www.andregarzia.com All We Do Is Code.
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