[es] - Virtualna memorija, postavke

Ledeni83
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^{19.04.2009. u 23:35 - pre 182 meseci}

Virtuelna memorija (odn. pagefile ili swap) ne bi trebala biti veca od 2048MB jer fizicke imas na pretek. Koliko ce vreme OS-u trebati dok i toliko podataka ucita. Sto budes povecavao tu vrednos to ce ti OS vise shkrabati po disku i zauzimace ti vise prostora. (a usput mozda izgubi na brzini)

Pagefile bi bilo zgodno smestiti na drugi fizicki disk (ne na drugoj particiji na istom disku), mada i onda ubrzanje skoro da nije primetno.

Evo na mojoj masini imam 1536MB (ne volim da mi OS otima prostora) pagefile-a i sve radi dobro izuzev tupavog Crysis-a i Assassins' Creed-a, ali podnosljivo.

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Catch 22

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Re: Virtualna memorija, postavke

^{19.04.2009. u 23:54 - pre 182 meseci}

Wikipedia: Virtual memory

Wikipedia: Paging

Microsoft: How to set performance options in Windows XP

Citat:

Notes

* To have Windows select the best paging file size, click System managed size. The recommended minimum size is the same as 1.5 times the RAM on your computer, and 3 times that figure for the maximum size. For example, if you have 256 MB of RAM, the minimum size is 384 MB, and the maximum size is 1152 MB.
* For best performance, do not set the initial size to less than the minimum recommended size under Total paging file size for all drives. The recommended size is the same as 1.5 times the RAM on your computer. It is good practice to leave the paging file at its recommended size as performance can decrease if a paging file is too large. However, you may increase its size if you frequently use programs that use lots of memory, such as graphics programs or games.
* We strongly recommend that you do not disable or delete the paging file because this can lessen the computer's performance. However, if you decide to delete a paging file, set both the initial size and the maximum size to zero, or click No paging file.

_{[Ovu poruku je menjao Catch 22 dana 20.04.2009. u 01:06 GMT+1]}

The 11th Hour: The forces blocking change

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aleksandar-007

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Re: Virtualna memorija, postavke

^{20.04.2009. u 07:43 - pre 182 meseci}

Znaci, bilo bi dovoljno da i u min. i u max. upisem 2048?

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Ledeni83
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Re: Virtualna memorija, postavke

^{20.04.2009. u 10:43 - pre 182 meseci}

@aleksandar-007 otprilike da. Probaj zahtevnije aplikacije odn. igre pa ako stucaju a vazne su ti onda malo povecaj VM. Eksperimentisi malo.

Jos jedna vrlo bitna stvar: pokreni Disk Defragmenter i videces VM (zelene je boje). Ako je iz jednog komada onda ti je na optimumu. Ako je pocepan na vise fajlova onda i nema dovoljne brzine za izvrsavanje zahtevnijih aplikacija.
Dosta je dobra stvar da postavis min i max na istu vrednost.

@Catch 22 sve je to lepo i trebalo bi da je OK. I bilo je dobro s 256, 512, 768 i 1GB radne memorije. A sta kada imas sada 2, 3, 4 i vise GB rama. U praksi se pokazalo ne bas dobrim resenjem. Zasto je inace Vista donela TurboCache il kako vec bese da se zove ona tehnologija gde se koristi USB flash disk kao privremeni page file? Jer su flas diskovi brzi nago HDD. A i to je pitanje koliko se dobije na brzini.
Evo OS mi je na WD-u koji ima prosek brzine 65MB/s i ja sam u pocetku povecavao VM na 2x rama dakle 4096MB. Pa onda brzo uvideo da je HDD prespor i da koliko god mu podesis min i max ne moze da isprati zahteve aplikacija. OS (skoro) uvek alocira max i uvek nesto skraba po disku sto je kod nekih aplikacija dovelo do pada brzine (istina ne mnogo). I onda (eksperimentisanjem) mu smanjim VM na gorepomenutih 1536MB. I zadovoljan sam. Ne smara mi HDD a i brzina je zadovoljavajuca.

_{[Ovu poruku je menjao Ledeni83 dana 20.04.2009. u 13:57 GMT+1]}

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Catch 22

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Re: Virtualna memorija, postavke

^{20.04.2009. u 19:38 - pre 182 meseci}

Citat:

Ledeni83: ...TurboCache il kako vec bese da se zove ona tehnologija gde se koristi USB flash disk kao privremeni page file?Jer su flas diskovi brzi nago HDD. A i to je pitanje koliko se dobije na brzini.

??? Ja ne znam za takve "flas diskove" (Ako misliš na popularne "USB fleške")!!! USB 2.0 je daleko sporiji nego SATA 2 (...2-10 puta sporiji!).

Brzi od danasnjih hard diskova su SSD (Solde State Drive), koji ce u skorijoj buducnosti nacisto zameniti danasnje hard diskove, kada se odomaci Win7 i njegovi eventualni naslednici

Citat:

SSDs and Microsoft Windows
Windows is optimized for hard disk drives rather than SSDs. Microsoft created ReadyBoost to exploit characteristics of USB-connected flash devices, but Windows operating systems are not optimized for use of SSDs. Microsoft's latest OS Windows 7 which is still in beta, is optimized for SSDs as well as hard disks.

ReadyBoost (objasnjenje)

Citat:

The core idea of ReadyBoost is that a flash drive has a much faster seek time (less than 1 millisecond), allowing it to satisfy requests faster than a hard disk when booting or reading certain system files. It also leverages the inherent advantage of two parallel sources from which to read data. Unfortunately, USB flash drives are relatively slow for sequential reads and writes, compared to modern desktop hard drives. Desktop hard drives can sustain anywhere from 2 to 10 times the transfer speed of USB flash drives. However, USB flash drives hold an advantage in random access times: typically around 1ms, compared to 12ms and upwards for desktop hard drives.

On laptop computers the performance shifts more in the favor of flash memory, laptop memory being priced relatively higher than that for desktop systems, and with many laptops using relatively slow 4200 RPM and 5400 RPM hard drives. Additionally, on a laptop, ReadyBoost caching can reduce hard drive access, allowing the hard drive to spin down for increased battery life.[8] Also, because of the nature of the power management typically enabled during mobile use of a laptop it is a more power efficient way of increasing equipment productivity.

Some computer manufacturers have called NAND flash caching (Intel's Turbo Memory technology) performance into question.[9] According to an online June 2007 review by Anand Lal Shimpi on Anandtech.com, TurboMemory results in negligible performance or battery life gain, despite the fact that TurboMemory adds an average of $100 to the price of a laptop.[10]

Prior to Vista Service Pack One (SP1), ReadyBoost was quite ineffective when the computer/laptop was put to sleep. ReadyBoost failed to recognize the data in the cache and restarted the caching process when returned from sleep mode. Vista SP1 addresses this problem.

ReadyDrive (objasnjenje)

Citat:

ReadyDrive (not to be confused with ReadyBoost) is a feature of Windows Vista that enables Windows Vista computers equipped with a hybrid drive or other Flash memory caches (such as Intel Turbo Memory) to boot up faster, resume from hibernation in less time, and preserve battery power.[3] Hybrid hard drives are a new type of hard disk that integrates non-volatile flash memory with a traditional hard drive. The drive-side functionality is expected to be standardized in ATA-8.

It was reported in eWeek that the technology is not being utilized to full extent due to lack of hybrid drive-specific drivers.[4] It was also reported that Microsoft is no longer making drivers for the hybrid drives and instead delegated the job to the device manufacturers.
However, Microsoft rebuffed the suggestion that it was not providing specialized drivers for hybrid systems. Also, in June 2006, David Morgenstern wrote an article for eWeek suggesting that ReadyDrive might sacrifice data integrity for speed and battery savings.[6] Documentation from Microsoft, however, claims that a copy of the data is always maintained on the hard disk, so there is no question of data loss even if the flash cache fails.

The 11th Hour: The forces blocking change

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Ledeni83
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Re: Virtualna memorija, postavke

^{20.04.2009. u 20:54 - pre 182 meseci}

Da mislio sam na ReadyBoost. Promovisu kao navodno bolje performanse a niko se ne pohvali od toga. Samo su te fleske skuplje :)
Sad nesto kao prave USB3.0 koje je navodno brzi i pouzdaniji, a videcemo sta ce od toga biti.

Veza izmedju kolicine rama i VM-a (moj prethodni post) je probana na par masina. I onda sam zakljucio (racunajuci brzine HDD) da vise od 2GB VM-a je samo gubljenje prostora na hardu. Naravno sve opcije moraju se isprobati jer jedinoe eksperimentisanjem se moze utvrditi "idealna" velicina.

Pojavom SSD-a (DDR3 i ko-zna-sta-jos) se stvari mozda preokrenu, ali sa njegovom sadasnjom cenom mozemo samo da citamo review-e na netu :)

POZZ

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