# CHEP04

27 September 2004 to 1 October 2004
Interlaken, Switzerland
Europe/Zurich timezone

## Linux for the CLEO-c Online system

28 Sep 2004, 10:00
1h
Coffee (Interlaken, Switzerland)

### Coffee

#### Interlaken, Switzerland

Board: 25
poster Track 1 - Online Computing

### Speaker

H. Schwarthoff (CORNELL UNIVERSITY)

### Description

The CLEO collaboration at the Cornell electron positron storage ring CESR has completed its transition to the CLEO-c experiment. This new program contains a wide array of Physics studies of $e^+e^-$ collisions at center of mass energies between 3 GeV and 5 GeV. New challenges await the CLEO-c Online computing system, as the trigger rates are expected to rise from < 100 Hz to around 300 Hz at the J/Psi production threshold, with a moderate increase in data throughput requirements. While the current Solaris and VxWorks based readout system will perform adequately under those conditions, there is a desire to improve the performance of the central components to extend monitoring capabilities and provide larger safety margins. The solution, as in most modern particle detector systems, is to deploy Linux on Intel architecture computers for the performance critical applications. For reasons of hardware and software availability, the existing CLEO Online and Offline computing environment has been ported to the Linux platform. This development allows the described challenge to be met. In this presentation, we will report on our experiences adapting the CLEO Online computing system for operation under Linux. Issues regarding third party software and code portability will be addressed. Performance measurements will be presented.

### Primary authors

H. Schwarthoff (CORNELL UNIVERSITY) T. Wilksen (CORNELL UNIVERSITY)

### Presentation Materials

 main paper