On Friday 16 of September 2011 08:46:51 erik quanstrom wrote: > On Fri Sep 16 01:57:04 EDT 2011, rminn...@gmail.com wrote: > > for the 2M pages -- I'm willing to see some measurement but let's get > > the #s -- I've done some simple measurements and it's not the hit one > > would expect. These new machines have about 10 GB/s bandwidth (well, > > the ones we are targeting do) and that translates to sub-millisecond > > times to zero a 2M page. Further, the text page is in the image cache. > > So after first exec of a program, the only text issue is locating the > > page. It's not simply a case of having to write 6M each time you exec. > > however, neither the stack nor the heap are. that's 4MB that need to be > cleared. that sounds like an operation that could take on the order of > ms, and well-worth measuring.
keep a pool of clean pages in kernel. upon exec use fresh ones for stack and heap, clean old ones in background. employ DMA controler when possible. -- dexen deVries [[[↓][→]]] For example, if the first thing in the file is: <?kzy irefvba="1.0" rapbqvat="ebg13"?> an XML parser will recognize that the document is stored in the traditional ROT13 encoding. (( Joe English, http://www.flightlab.com/~joe/sgml/faq-not.txt ))
