Re: [Freedos-user] UIDE Performance -- Small Caches DO Work O.K.!
Welcome back! Sent from my iPhone On 23/08/2011, at 23:50, Jack wrote: > > For years, I have told people to use as much cache as > possible with UIDE, to handle today's large files and > still "leave space in the cache" for DOS directories. > > Today, Tuesday 23-Aug-2011, I ran "experiments" using > a driver equal to UIDE-S, with a new 10-MB cache size > of 1280 8K-byte data blocks. I never liked the 5-MB > cache that some users MUST have (only 640 blocks, not > enough data!) so I chose to try a 10-MB "tiny" cache. > > I ran my usual test of copying a 635-MB video drivers > CD to disk. With my regular 500-MB UIDE cache, this > test takes around 124 seconds, plus-or-minus about 2. > > With only the 10-MB cache, the test took 128 seconds, > merely 4 seconds more! I checked 25, 50, and 100-MB > caches as well, and none suffered in speed from being > small-sized! Each performed as well, maybe a "hair" > better in some cases, as the 10-MB cache! > > So, it seems I may have been "All wet!" (misinformed) > re: UIDE's cache performance v.s. cache size. Users > may want to check this on their systems, maybe across > a variety of applications. And I expect there are a > few "large file" systems which do need larger caches. > > But, it now seems that "casual" users of DOS and UIDE > need NOT worry re: using only a 25/50/100-MB cache -- > They do seem to perform a LOT better than I expected! > > Jack R. Ellis > > > -- > EMC VNX: the world's simplest storage, starting under $10K > The only unified storage solution that offers unified management > Up to 160% more powerful than alternatives and 25% more efficient. > Guaranteed. http://p.sf.net/sfu/emc-vnx-dev2dev > ___ > Freedos-user mailing list > Freedos-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freedos-user -- EMC VNX: the world's simplest storage, starting under $10K The only unified storage solution that offers unified management Up to 160% more powerful than alternatives and 25% more efficient. Guaranteed. http://p.sf.net/sfu/emc-vnx-dev2dev ___ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
Re: [Freedos-user] dos backups in the 21st century?
Hello Ray, Thanks for sharing pictures of your setup. It's a real fascinating setup. Other than a duplicating machine, what function does it serve while connected to your network? Thanks, Jim On Fri, Aug 19, 2011 at 7:38 PM, Ray Davison wrote: > Karen Lewellen wrote: > > A question mainly for those who use dos alone and purely on your > > machines. I am asking how you do large backup work yourself now? say > > 3 gig or so? > > I have a couple suggestions for your consideration. > > First, anyone who is doing anything serious with a PC needs this: > http://www.dfsee.com/ > It works on DOS, OS/2, Win and Linux, and the CD boots FreeDOS. > > The most powerful thing it does is fix confused HDDs; like lost > partition tables. And the author will help. > > It also does a bit-for-bit, drive-to-drive copy. This is a pic of my > backup and storage box. > > https://picasaweb.google.com/110720715566253280768/ScreenShots#5620366853489847778 > > It is connected to a LAN, but it is also the ultimate sneaker net. All > my HDDs, on every machine, are front panel plugin. Backup consists of; > plug in the HDD you want to copy, plug in a blank HDD at least as large > as what you want to copy, boot - the racks are hot swappable, the OSs > are not - , run DFSee, select the partition(s) or drive to be copied, > and go to lunch. > > Restore just reverses the process. > > Ray > > > -- > Get a FREE DOWNLOAD! and learn more about uberSVN rich system, > user administration capabilities and model configuration. Take > the hassle out of deploying and managing Subversion and the > tools developers use with it. http://p.sf.net/sfu/wandisco-d2d-2 > ___ > Freedos-user mailing list > Freedos-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freedos-user > -- EMC VNX: the world's simplest storage, starting under $10K The only unified storage solution that offers unified management Up to 160% more powerful than alternatives and 25% more efficient. Guaranteed. http://p.sf.net/sfu/emc-vnx-dev2dev___ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
Re: [Freedos-user] UIDE Performance -- Small Caches DO Work O.K.!
Hi, I cannot resist... in the following read my comments on caching and buffering. Even Windows XP (did not try nore recent versions yet) suffers from bad buffering when copying files from and to the same harddrive. It takes 10x to 100x time compared to copying from one drive to another one. I installed SuperCopier 2.2 beta which catches Explorer copy actions and does them itself. Well, now you are able to define huge buffers... but it does not help much, because its a question of filling and flushing the buffer, as XCOPY did. !!! beware, supercopy has got a bug when using buffers larger than 64k, causing it to abort the operation on files larger than 4 gig. !!! Caching does not help much with operations like this. Ok, caching FAT and directories... When working with large files, you always have to code buffering on your own. For example, I compiled mplex (mpeg muxer) myself using cygwin. Works correctly but uses the wrong file mode. Result is my RAM gets filled with cached data from the target file. Everything else gets paged out. The system breaks down to almost unusable until the process is finished. Then it takes decades to swap in the other programs again... What I want to say is, you can have Terabytes of RAM, it won't help in a case like this when the file operation is about as large as your RAM. If there was an upper limit for the amount of cache used for a single file, there would be no problem at all. So small caches sometimes perform even better! So guys go tell M$ how to write an operating system! JPT -- EMC VNX: the world's simplest storage, starting under $10K The only unified storage solution that offers unified management Up to 160% more powerful than alternatives and 25% more efficient. Guaranteed. http://p.sf.net/sfu/emc-vnx-dev2dev ___ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
