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Hi Andy, very nice indeed! I love 64bits and large memory machines, but why does it not work when mapping file <2GB on 32bits? Or does it but is the performance increase less dramatically? -- Fons Andrew Hanushevsky wrote: > Hi Fons, > > We've just completed our performance tests with memory mapped I/O. The > results were excellent. Server overhead decreased by 50% and client > latency was decreased by at least 20%. 100% network utilization can > now be easily reached. This is very good news for systems like proof. > > While memory mapped I/O produces excellent results it can only be used > in specific circumstances where you have a lot of memory and a 64-bit > address space. So, it is not on be default. Configuration is trivial > and you have a lot of options, including being able to specify precisely > which files should be memory mapped independently of the configuration > file. > > Andy -- Org: CERN, European Laboratory for Particle Physics. Mail: 1211 Geneve 23, Switzerland E-Mail: [log in to unmask] Phone: +41 22 7679248 WWW: http://www.rademakers.org/fons/ Fax: +41 22 7679480