i was just doing a scan for bad stuff and i was going through the help and support thing for windows and came across virtual memory.
after reading through it i had an idea, but not really sure so doing research.
okay i have 513mb of ram. and that doesn't seem to be enough, i also have a 8 gig scuzy(i know thats not how its spelled) drive.
1. what can virtual memory do if i set it up on the scuzy?
2. how hi can i set the virtual memory?(found the answer to that one) what effect will it have?
3, i know virtual memory will probly not be as effective as real ram but what kind of performance can i expect?
4. and what are some pros and cons?
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Virtual memory is over-flow storage. Roughly 1/100 th speed of RAM. Comes in to play if you have a bunch of apps running at the same time. Your PC will relocate the least-used memory storage to disk and give the RAM to an active app. When it needs the data back it boots something else out of RAM and reloads it. Slow. But it does allow more efficient use of RAM.
Noisy Crow is quite right. On top of that though a 8gb SCSI drive would be incredibly slow. I have a Seagate 8gb SCSI Drive and it's maximum read/write is 40 meg a second. Not exactly as Dazzling as new ATA Drive. So if you were going to use a drive for Virtual Memory you won't want to use a 8gb SCSI.
If you have 2 or more drives (not partitions) you may want to move your swap file to the other hard drive. Sometimes this can speed things up (a little)
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thanks for all the help. from what i have read here and else where it seems that this isnt gonna be anywhere near as good as getting physical ram. but right now this is all that i have to work with so its better than nothing.
i have read that you should put like 2mb on one drive and the rest on the other?? im confused about this. i do have 2 different drives(not partitioned) why would i want to put 2mb on one?.
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Which drive to put the virutal memory on is a compromise.... unless you can dedicate a drive for it. Even then, that drive would ideally be your fastest one...
Generally, when your PC starts using virtual memory it is becsause it is loading another application or data for a loaded application from disk. With a single drive this results in a lot both reading and writing, almost certainly on different parts of the drive. The worst access time for a hard drive is when the read/write head has to jump all over the place.... so if you can put the virtual memory on a different drive, the head movement is dramatically reduced, resulting in much better transfer speeds. This is true even with IDE where the two drives share a channel. The tricky bit is when the virutal memory shares a drive with other stuff... 'cause as soon as your PC starts using virtual memory for apps/data on that drive the heading thrashing kicks in.
(BTW: Note that I said two DRIVES, not two partitions on the same drive!).
Also: A relatively small amout of additional RAM can make a big difference. If you add even 128MB to the 512MB you already have you will notice an improvement.
i can dedicate a drive for this(8gig scsi. no partitions. nothing on this drive. would be used only for virtual memory). the other drive i have is the 80 gig ide that came with the computer.
hope that clears it up
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Ah! Well, in that case I would try setting up 1GB (1024 MB) of virtual RAM on that drive and see how things work. (General recommendation is that virtual memory should be about 2X your RAM.) You can use the rest of the drive for backups....
To cover off J-Roc's comment about the speed... that all depends on the drive and the controller. In one machine I have a pair of 9GB drives that spin at 10,000 and very high throughput - max is 80MB/s. That said, even if the throughput is relatively slow, you will still likely get better performance than running with the virtual memory on the main drive.
yeah mine is a 10,000 rpm one. ithink(im pretty sure it is if not its a 7200)
right now i haven't played around with the virtual memory but on my main drive i have the initial size at 763mb and the max size at 1199mb. earlier today i had run out of virtual memory.
how many mb=gig? i think ill start at 2gigs
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A more common term for virtual memory is swap space. My new machine has 1GB of RAM and 1GB of swap. When there's plenty of RAM, just make a swap partition of the same size as the RAM unless there are special requirements.
Very interesting things happen with Gigabyte's RAMdisk card. When you install a RAMdisk card in your computer and configure it for swap, the RAMdisk essentially becomes the main RAM and the RAM plugged into the motherboard becomes a L3 cache.
I'd be interested in a RAMdisk card that plugs into a PCI-E slot. That could just become an interesting way to add RAM to a machine that is otherwise all filled up. Really nice for database servers, etc.
Quote:
how many mb=gig? i think ill start at 2gigs
1GB = 1024MB (not 1000MB because of binary numbers)
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Originally Posted by A friend of mine who has a Linux kernel named after his girlfriend.
If I was VirtualBox, I could load my virtualization module into Hannah and boot up another kernel in the same address space.
1GB = 1024MB (not 1000MB because of binary numbers)
True only until you buy a hard drive. Then the marketing version of 1 GB=1000 MB is used 'cause that results in a bigger number on the promo material... :)
okay i have set my virtual memory to intitial(just over 1 gig) and max to 2 gigs and have restarted my puter. everything is going okay except one thing. i opened up task manager, under processess, under user name the major of the user names(20 out of 30) have nothing? normally it'll be either system, local service, or the user. what happened?
here's a pic:
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?? Don't have an immediate answer for that one. BTW, set the max and min to the same size (the current max). This eliminate the need to dynamically resize the swap file, which does chew off some resources...
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