disk

Delphi and HDD I/O Quoting , Resource Pre-Caching , Read/Write/seek parameter limiting

*爱你&永不变心* 提交于 2020-01-04 09:18:27
问题 I have dynamic array filled with bytes, which are read from .raw file with BlockRead() and this operation, logically, requires hell of a Shell resources and I wanted to know if there is any methods to reserve some amount or limit maximum amount of Read/Write/Seek used for Program run time from Hard Disk Drive***** [Clarification] : I meant to set maximum reading speed from HDD while performing action with windows shell / internal app resources. In this moment app is very sensitive to hdd's

best disk saving strategy for “replacement inserts”

柔情痞子 提交于 2020-01-04 05:37:16
问题 Every day I delete hundreds of thousands of records from a large table, then I do some calculations (with new data) and replace every one of the records that I previously deleted. I thought doing regular vacuum tbl would do the trick. I know it doesn't return disk space to the server, but (because of the pg docs) I thought because I was inserting about as many records as I was deleting, I wouldn't loose any/much disk space. However, after moving the table to a different namespace (for an

Correlate Physical Device ID to Volume Device ID

点点圈 提交于 2020-01-04 04:23:06
问题 I'm trying to utilize WMI via PowerShell to run through SAN storage on remote servers to grab the Windows disk management volume label. The only way I've found to do this is to correlate the volume device id ( \\?\Volume{34243...} with the physical disk device ID ( \\.\PHYSICALDRIVE01 ). However, I haven't been able to find out how to link those two fields together. Is this possible with WMI? 回答1: For volumes that were assigned a drive letter you can correlate disks and volumes like this: Get

How to save assembly to disk?

我与影子孤独终老i 提交于 2020-01-03 17:07:29
问题 How I can save assembly to file? I.e. I mean not dynamic assembly but "normal" in-memory assemblies. Assembly[] asslist = AppDomain.CurrentDomain.GetAssemblies(); foreach (Assembly ass1 in asslist) { // How to save? } This situation can occur when the application loads some referenced assemblies from resources. I want to save them to disk. It is impossible to extract assemblies form resources because they are encrypted there. 回答1: How about trying to serialize the assembly? It is serializable

In Python, how do I check if a drive exists w/o throwing an error for removable drives?

旧街凉风 提交于 2020-01-01 02:44:16
问题 Here's what I have so far: import os.path as op for d in map(chr, range(98, 123)): #drives b-z if not op.isdir(d + ':/'): continue The problem is that it pops up a "No Disk" error box in Windows: maya.exe - No Disk: There is no disk in the drive. Please insert a disk into drive \Device\Harddisk1\DR1 [Cancel, Try Again, Continue] I can't catch the exception because it doesn't actually throw a Python error. Apparently, this only happens on removable drives where there is a letter assigned, but

Fast Poisson Disk Sampling [Robert Bridson] in Python

非 Y 不嫁゛ 提交于 2019-12-31 04:50:05
问题 First of all, I implemented the ordinary, slow, Poisson Disk Sampling algorithm in the 2D plane and it works just fine. This slow version calculates the distances between all points and checks that the point you wish to place is at least R away from all the others. The fast version by Robert Bridson, available here: https://www.cs.ubc.ca/~rbridson/docs/bridson-siggraph07-poissondisk.pdf, suggests discretizing your 2D plane into quadratic cells with length = R/sqrt(2) since each cell can at

When exactly do things get removed from urlcache's memory and disk?

核能气质少年 提交于 2019-12-29 07:52:25
问题 let memoryCapacity = 200 * 1024 * 1024 let diskCapacity = 1 * 1024 * 1024 let cache = URLCache(memoryCapacity: memoryCapacity, diskCapacity: diskCapacity, diskPath: "myDataPath") URLCache.shared = cache Scenario1 I'm setting urlcache's memory to 200mb and setting the disk space to 1mb. Then I download an image. Turn off internet and force quit the app, launch the app again by tapping it, and trigger a call (to download image) but it immediately crashes because data is nil Needless to say if I

How to take advantage of Disk IO queueing

孤人 提交于 2019-12-24 00:07:52
问题 I need to read small sequences of data from a 3.7 GB file. The positions I need to read are not adjacent , but I can order the IO so that the file is read from beginning to end. The file is stored on a iSCSI SAN which should be capable of handling/optimizing queued IO. The question is, how can I make a one shot request of all the data/positions I need in one go? Is it possible? I don't think async IO is an option because the reads are very small (20-200 bytes) Currently the code looks like

Efficiency in writing to disk in Fortran

不想你离开。 提交于 2019-12-23 23:53:23
问题 I am trying to write a bunch of large matrices in fortran to disk. Matrices are V , C and d . All have size (2 , n1, n2, n3, n4, n5). These are large matrices. And fortran is taking around 3 hours to write them. do ind1=1,n1 do ind2=1,n2 do ind3=1,n3 do ind4=1,n4 write(filename,'(a,i0,a,i0,a,i0,a,i0,a,i0,a)')'PF',t,'_',ind1,'_',ind2,'_',ind3,'_',ind4,'.txt' OPEN(UNIT=25,FILE=filename,STATUS='replace',ACTION='write') do ind5=1,n5 WRITE(25,*) c(2,ind1,ind2,ind3, ind4,ind5) end do do ind5=1,n5

Low-level disk I/O in Golang

痴心易碎 提交于 2019-12-23 09:33:25
问题 Wondering if there has been anyone experimenting with low-level disk I/O, such as reading raw sectors, MBR, etc. I've done some digging around myself, but haven't been able to find anything mentioned about it. Most of it is dead ends where someone is talking about Go's native io package. Any leads would be appreciated. 回答1: I am still new to go so my example is not particularly elegant, but I think this is what you want: package main import ( "syscall" "fmt" ) func main() { disk := "/dev/sda"