All Questions
15
questions
-2
votes
1
answer
106
views
CPU and its operations
The 3 operations performed by a CPU are:
Transfer of data between memory and I/O
Logical and Arithmetical functions
Program flow through simple decisions
I dont understand what the 3rd operation is ...
- 107
0
votes
0
answers
502
views
Find exactly what PHP files are responsible for each PHP process
I have a WordPress website hosted on a shared Red Hat 4.4.7-18 Linux box, and from time to time I get huge memory and I/O spikes exceeding my allowed memory limit, making my website unresponsive.
I ...
1
vote
0
answers
303
views
How to redirect file I/O operations of a process to memory or a different file?
Let's say I have a file named file.txt and a running process with PID 12345 which sometimes reads and sometimes writes to that file.
Is there any way I can fool the process with PID 12345 to read or ...
- 129
0
votes
0
answers
807
views
How are PCI(e) errors propagated to userspace in case of errors?
PCIe supports various error reporting mechanisms, and I can see how a device driver would interface with these capabilities to handle specific error types and reinitialize the device in question as ...
- 1,311
1
vote
2
answers
2k
views
Does a x86 computer use the pci bus and pci protocols to access memory?
After viewing lspci -k:
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller (rev 06)
Subsystem: CLEVO/KAPOK Computer Device 5455
00:02.0 VGA compatible ...
- 178
1
vote
1
answer
28k
views
Is there a way to limit buffer cache size in linux?
I've got program consuming a lot of memory during I/O operations, which is a side effect of performing loads of them. When I run program using direct_io the memory issue is gone but time it takes for ...
- 222
0
votes
2
answers
207
views
Force a process in Windows 7 to store capture in RAM without doing actual I/O operation and writing to the disk
I'm Using Wireshark's cyclic buffers configuration capturing mode:
I am sniffing a 10Gig port, and I was expecting Wireshark to work cyclically with buffers on the DDR only, but apparently it doesn't....
- 332
2
votes
1
answer
4k
views
Diagnosing disk i/o errors, failing disk controllers
My PC has been constantly crashing with disk i/o errors recently and I'm trying to diagnose what the cause is before I order any new parts.
I have windows 7 installed on a ssd (with truecrypt) and I ...
- 23
3
votes
3
answers
1k
views
Does an IO port address belong to RAM?
I have been using Linux (Ubuntu). To communicate with IO devices, IO port addresses are used. For example, 0x378 is an address for a parallel port.
Is an IO port address an actual RAM address? If it'...
- 157
0
votes
3
answers
1k
views
Find which process uses on average the most CPU, Memory and IO on Windows 7
I'd like a way to monitor processes on Windows 7 for average CPU, Memory and IO since last boot.
I would love it if it was a nice UI friendly tool that could sort processes by Average CPU, Average ...
- 157
26
votes
3
answers
33k
views
Difference between port mapped and memory mapped access?
Can anyone explain what's the difference between port mapping and memory mapping, and what having both accomplishes? Why is there port mapped, how does it differ in structure from memory maps, and is ...
user291288
3
votes
5
answers
5k
views
How can RAM contain a "memory map" if RAM is unaware of the overall system?
This question concerns hardware more than software. Basically, citing from this article on memory maps, it says that:
In computer science, a memory map is a structure of data (which usually resides ...
user274686
1
vote
1
answer
4k
views
"Error allocating I/O BAR for PCI device" when booting Windows 7 [duplicate]
Possible Duplicate:
Error allocating Mem BAR for PCI Device 0X/00/0.
I have a Dell Optiplex 380. When I try to boot Windows 7 normally I get the following after the Windows loading screen:
*** ...
- 1,751
2
votes
1
answer
6k
views
Memory interfacing and IO interfacing
What is the difference between memory interfacing and IO interfacing ?
- 425
0
votes
1
answer
1k
views
CPU I/O communication
I know there is this question already discussed, but I still don´t understand something, so please just help me clarify it.
What I understand there is 2 way to do I/O aka communicate from CPU with ...
- 799