Visit Our UNIX and Linux User Community


is process data cached somewhere?


 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers is process data cached somewhere?
# 1  
Old 07-20-2010
is process data cached somewhere?

hi

When I search a file with find, the subsequent search process takes relatively less time.
Is it cached somewhere in RAM altough the process died?
# 2  
Old 07-20-2010
Disk information (including directory contents) that has recently been access is stored in the disk cache in memory by the kernel should it be needed again. Until something overwrites this cache (eg. a newer read on a large file) or the related data on the disk gets changed (the cache pages becomes "dirty") any reads on that data are done in memory.
# 3  
Old 07-20-2010
Also, modern disk hardware caches large amounts of data, which also has an effect like the one pludi explained.
# 4  
Old 07-20-2010
More specifically, any RAM not in use by other things can and will be used by the kernel to cache the disk. Why not? It'd be sitting around doing nothing otherwise, and the kernel still gives it up as willingly as empty RAM when it's needed for something else.
 

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. SuSE

Cached account info

Hello, A admin at work created accounts for me on about 20 SLES 11 servers. He gave me the wrong home directory. He also didn't create a home directory for me on the servers. I have root/sudo on the systems. I usually use the usermod command or just modify the /etc/passwd file to fix issues like... (11 Replies)
Discussion started by: bitlord
11 Replies

2. HP-UX

How to extract data for a specific process from ovpa?

Hi Friends, One question. Supposed I want to extract data only for process named "sqlplus" how can I do it. Any suggestions? I don't want all the data as it is not useful to me e.g.. Command I use is given below extract -xp -p -r repfile -b"03/15/13 7:00 PM" -e"03/15/13 09:30 PM" -f... (1 Reply)
Discussion started by: kunwar
1 Replies

3. UNIX for Dummies Questions & Answers

Difference between buffered disk reads and cached reads?

I was analyzing the Disk read using hdparm utility. This is what i got as a result. # hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 108 MB in 3.04 seconds = 35.51 MB/sec # hdparm -T /dev/sda /dev/sda: Timing cached reads: 3496 MB in 1.99 seconds = 1756.56 MB/sec... (1 Reply)
Discussion started by: pinga123
1 Replies

4. UNIX for Advanced & Expert Users

GID mappings cached?

We had a mapping to one UNIX box just fine, the server was changed to another UNIX box and now when mapping drives from Windows box to new UNIX box, we get the old GID associated with our Windows user. When checking on new UNIX box, we see GID of 108, which is what we want, but when we map the... (0 Replies)
Discussion started by: bd4021
0 Replies

5. Shell Programming and Scripting

data sharing between process

hi ! i want to make 2 c prog such tht if i give an input in 1st prog then i can use tht input in 2nd. so over all i want to do data sharing between process using files. plz give me suggestions how can i achieve this ? thanks ya! (2 Replies)
Discussion started by: Sgupta
2 Replies

6. Programming

how to get the process data structure through pid?

hello guys, i'm required to modify the process scheduling part of the freebsd kernel as part of our homework. the homework needs us add a new variable to the process data structure, and the priority of the process will be having something to do with the variable. to adjust the variable... (2 Replies)
Discussion started by: billconan
2 Replies

7. UNIX for Dummies Questions & Answers

Release the memory which is cached.

Hi, Can any one suggest me the way how can get mamory which has been cached during a process execution without rebooting the machine? (1 Reply)
Discussion started by: siba.s.nayak
1 Replies

8. Shell Programming and Scripting

How should i know that the process is still processing data

I have some process . How should i know that the process is still processing data or got hanged even though it is showing that it is running in background I know of a command called truss. how should i use this command and determine 1) process is still processing data 2) process got hanged... (7 Replies)
Discussion started by: ali560045
7 Replies

9. UNIX for Dummies Questions & Answers

dummy question on data process

I have a file which contains 6 columns. But I only need the first 3 columns. So I need to remove the last 3 columns. I checked 'cut' but it seems not working. So is there a command that could remove certain columns from a file? :( Thanks a lot!! (5 Replies)
Discussion started by: kaixinsjtu
5 Replies

10. UNIX for Dummies Questions & Answers

how to remove cached squid??

hi, how do i remove the cache from squid automatically every day?/ ie., from /var/spool/squid/ all the directories which has been cached here and restart ONLY squid without rebooting the system, including the swap.state files thanx in advance cheers (1 Reply)
Discussion started by: balu
1 Replies

Featured Tech Videos