On 24-08-16 05:47, Anand Shenoi wrote:

Hi Jaap!

Typical and common grammar issue :) Sorry for that!

Precisely, it is the same scenario we had in the last regional. We started contest at 05:00 PM IST and in the first 5 minutes itself the submissions started queuing. We stopped in no time - since it was a testing contest.

Just from a quick glance, I see 454 judgings by judgehost1 in 1 hour. That's 8 seconds per judging on average. Depending on the size of the test cases that seems quite reasonable to me. So if these submissions all came in at the first 5 minutes from 23 teams, then they are overloading the system. There's not much you can do except adding more judgehosts or telling teams not to do this.

Jaap

On Tue, Aug 23, 2016 at 6:00 PM Jaap Eldering <jaap@jaapeldering.nl mailto:jaap@jaapeldering.nl> wrote:

Hi Aneesh,

On 23-08-16 02:13, Aneesh R wrote:
> Hi,
>
> On August 22nd at 17:00 IST to 18:00 IST we had conducted a practice
> session with our local  domjudge server , this is only testing the
> potential of our domjudge server and used only one judgehost for this
> session.  Two sets of problems are included in this session, the
> solutions are already shared with our students (23 users)

From here on I find it difficult to understand precisely what happened:

> they are continually submitting the solutions when the
> contest starts  woefully the all submissions are going to the
QUEUED and
> the compilations are in PENDING , then we are announced to
> all students to stop their submissions and they can logout by
17:30 IST
> and we are waiting to finish all the pending submissions it take
around
> 18:10 IST

Could you explain again step by step what _actually_ happened and what
you _expected_ to happen? Preferably do so in short sentences.

Best,
Jaap


> We don't know what's happening on the server . So we are attaching the
> server logs with this mail kindly verify and suggest me some solutions
>
> Regards
> Aneesh

On 25-08-16 04:08, Aneesh R wrote:

We used the following configuration for the last contest.

*Domserver Configuration Details** * Operating system : Ubuntu 12.04.5 LTS domjudge version -5.0.1 Apache/2.2.22 (Ubuntu) mysql 5.5.47 RAM : 10 GB

*Judgehost Configuration Details* Operating system : Ubuntu 12.04.5 LTS RAM : 10 GB

We would be glad to know your recommendation for 400 users to connect also we can't be sure of submission at the last 10 minutes of the contest and that we can't restrict submission

I cannot give a simple recommendation: this really depends mostly on how many and how large test cases you have, what the problem timelimits are, and how much teams will submit. The hardware looks fine, but doesn't influence this so much.

We've been recommending as a rule of thumb about 1 judgehost per 20 teams. This has been sufficient for our (sub)regional contests in NW-Europe, and also at the World Finals, but again: your mileage may vary!

The best thing you can do is analyze previous contests and check how many submissions there were, and how busy the judgehosts were.

Jaap

On Wed, Aug 24, 2016 at 7:21 PM, Jaap Eldering <jaap@jaapeldering.nl mailto:jaap@jaapeldering.nl> wrote:

On 24-08-16 05:47, Anand Shenoi wrote:
> Hi Jaap!
>
> Typical and common grammar issue :) Sorry for that!
>
> Precisely, it is the same scenario we had in the last regional. We
> started contest at 05:00 PM IST and in the first 5 minutes itself the
> submissions started queuing. We stopped in no time - since it was a
> testing contest.

Just from a quick glance, I see 454 judgings by judgehost1 in 1 hour.
That's 8 seconds per judging on average. Depending on the size of the
test cases that seems quite reasonable to me. So if these submissions
all came in at the first 5 minutes from 23 teams, then they are
overloading the system. There's not much you can do except adding more
judgehosts or telling teams not to do this.

Jaap


> On Tue, Aug 23, 2016 at 6:00 PM Jaap Eldering <jaap@jaapeldering.nl <mailto:jaap@jaapeldering.nl>
> <mailto:jaap@jaapeldering.nl <mailto:jaap@jaapeldering.nl>>> wrote:
>
>     Hi Aneesh,
>
>     On 23-08-16 02:13, Aneesh R wrote:
>     > Hi,
>     >
>     > On August 22nd at 17:00 IST to 18:00 IST we had conducted a
practice
>     > session with our local  domjudge server , this is only
testing the
>     > potential of our domjudge server and used only one judgehost
for this
>     > session.  Two sets of problems are included in this session, the
>     > solutions are already shared with our students (23 users)
>
>     From here on I find it difficult to understand precisely what
happened:
>
>     > they are continually submitting the solutions when the
>     > contest starts  woefully the all submissions are going to the
>     QUEUED and
>     > the compilations are in PENDING , then we are announced to
>     > all students to stop their submissions and they can logout by
>     17:30 IST
>     > and we are waiting to finish all the pending submissions it take
>     around
>     > 18:10 IST
>
>     Could you explain again step by step what _actually_ happened
and what
>     you _expected_ to happen? Preferably do so in short sentences.
>
>     Best,
>     Jaap
>
>
>     > We don't know what's happening on the server . So we are
attaching the
>     > server logs with this mail kindly verify and suggest me some
solutions
>     >
>     > Regards
>     > Aneesh
>