Charles, Very good!
However, the documentaion only touches on point (1) of the three points I made in the report. It only mentions the issue with xinetd, but says nothing about the other things that make globusrun-ws so slow, or what to do about them. Keep up the good work! On 30.07.08, Charles Bacon wrote: > I see that they have added documentation about the latency to the > current docs: > http://www.globus.org/toolkit/docs/4.2/4.2.0/data/gridftp/admin/gridftp-troubleshooting.html#gridftp-troubleshooting-latency > > Additionally I removed the USERID/etc. entries from the example in the > 2.4.3 docs that were being referenced. > > > Charles > > On Jul 25, 2008, at 11:28 AM, Steve White wrote: > > >Hi, > > > >Progress has been made in this long discussion, but it has gotten > >rather > >complicated. > > > >Find attached a technical summary, including the observed problems, > >diagnosis, and remedies, as well as further suggestions. > > > >Let me address the question: is latency an important issue? > > > >I contend that it is a matter of degree and of application. How big > >is > >the latency? What latency is required by the user and application? > >How small a latency could be expected from grid job submission? > > > >In some cases, the latency has been so bad that a user might wonder if > >something was wrong, while they get a coffee. > > > >On the other hand, if an application really demands very fast > >interchange > >of small messages, maybe the grid (and a wide-area network in > >general) is > >not a good environment for it. Maybe a cluster is called for. > > > >Currently, at best globusrun-ws imposes a delay on small jobs some > >five > >times longer than that incurred by gsissh. That still amounts to a > >humanly-palpable delay of several seconds. > > > >Even if a code has been streamlined, it often in time picks up > >baggage; > >code streamlined for one purpose could be unnecessarily slow for > >another. > > > >In any case, it behooves us to strive for the best latency we can > >get with > >reasonable effort. > > > >Some suggestions are in the report. > > > >Cheers! > > > >| - - - - - - - - - - - - - - - - - - - - - - > >- - - > >| Steve White > >+49(331)7499-202 > >| e-Science / AstroGrid-D Zi. 35 > >Bg. 20 > >| - - - - - - - - - - - - - - - - - - - - - - > >- - - > >| Astrophysikalisches Institut Potsdam (AIP) > >| An der Sternwarte 16, D-14482 Potsdam > >| > >| Vorstand: Prof. Dr. Matthias Steinmetz, Peter A. Stolz > >| > >| Stiftung privaten Rechts, Stiftungsverzeichnis Brandenburg: III/ > >7-71-026 > >| - - - - - - - - - - - - - - - - - - - - - - > >- - - > ><latency-globusrun_ws.txt> > -- | - - - - - - - - - - - - - - - - - - - - - - - - - | Steve White +49(331)7499-202 | e-Science / AstroGrid-D Zi. 35 Bg. 20 | - - - - - - - - - - - - - - - - - - - - - - - - - | Astrophysikalisches Institut Potsdam (AIP) | An der Sternwarte 16, D-14482 Potsdam | | Vorstand: Prof. Dr. Matthias Steinmetz, Peter A. Stolz | | Stiftung privaten Rechts, Stiftungsverzeichnis Brandenburg: III/7-71-026 | - - - - - - - - - - - - - - - - - - - - - - - - -
