Condor TCP vs UDP Comparison

Condor can use either TCP or UDP for advertizing ClassAds? to a Collector. We thus test how the system performs in either of these two operation modes.

Test setup

The test consisted in running a fixed number of condor_advertise client publishing a master ClassAd? (15k total, 400 attributes) to a single collector in a tight loop.

The collector was running at Fermilab, on a dual Intel Xeon E5430 (2.66GHz, 24 total virtual cores) and 32G RAM. The clients were running on the sleeper pools either at Fermilab or at UCSD. The test was performed using the glideTester.

Using Condor 7.5.5.

Results

LAN results

In these tests, the clients were running at Fermilab, thus all the traffic was on the LAN.

Using GSI security (like glideinWMS usually does)

With 50 clients:

With 100 clients:

Disabling security
(SEC_DEFAULT_AUTHENTICATION = NEVER)

With 50 clients:

Disabling security and security negotiation
(SEC_DEFAULT_AUTHENTICATION = NEVER and SEC_DEFAULT_NEGOTIATION = NEVER)

With 50 clients:

WAN results

In these tests, the clients were runningat UCSD, thus all the traffic was on the WAN (O(60ms) RTT).

Only a subset of tests was run.

Disabling security and security negotiation
(SEC_DEFAULT_AUTHENTICATION = NEVER and SEC_DEFAULT_NEGOTIATION = NEVER)

With 50 clients:

With 200 clients:

-- IgorSfiligoi - 2011/02/01