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-1

(Stackoverflow said to post this here)

I read large files (3-10 GB) of binary data into program memory via C++ memory-mapping (mmap) on Linux. My access pattern is sequential- I read from beginning to end, no random accesses.

Would using a PCI-E SSD over a SATA SSD improve the latency? (I don't have one available to just test and find out).

I guess this ultimately depends on how exactly does the memory-mapping works. I don't think memory-mapping loads the entire file into RAM, but merely allocates a set of virtual addresses and streams the pages as they are required? (If this is true, how is it any different from streaming IO?).

If the pages are streamed, then I guess the answer depends on how quickly I process the data versus how quickly the bus can feed pages to the RAM? If my processing is slow, a PCI-E SSD would be pointless?

memory ssd performance operating-systems

share|improve this question

asked yesterday

user997112user997112

10117

add a comment | 

-1

(Stackoverflow said to post this here)

I read large files (3-10 GB) of binary data into program memory via C++ memory-mapping (mmap) on Linux. My access pattern is sequential- I read from beginning to end, no random accesses.

Would using a PCI-E SSD over a SATA SSD improve the latency? (I don't have one available to just test and find out).

I guess this ultimately depends on how exactly does the memory-mapping works. I don't think memory-mapping loads the entire file into RAM, but merely allocates a set of virtual addresses and streams the pages as they are required? (If this is true, how is it any different from streaming IO?).

If the pages are streamed, then I guess the answer depends on how quickly I process the data versus how quickly the bus can feed pages to the RAM? If my processing is slow, a PCI-E SSD would be pointless?

memory ssd performance operating-systems

share|improve this question

asked yesterday

user997112user997112

10117

add a comment | 

(Stackoverflow said to post this here)

I read large files (3-10 GB) of binary data into program memory via C++ memory-mapping (mmap) on Linux. My access pattern is sequential- I read from beginning to end, no random accesses.

Would using a PCI-E SSD over a SATA SSD improve the latency? (I don't have one available to just test and find out).

I guess this ultimately depends on how exactly does the memory-mapping works. I don't think memory-mapping loads the entire file into RAM, but merely allocates a set of virtual addresses and streams the pages as they are required? (If this is true, how is it any different from streaming IO?).

If the pages are streamed, then I guess the answer depends on how quickly I process the data versus how quickly the bus can feed pages to the RAM? If my processing is slow, a PCI-E SSD would be pointless?

memory ssd performance operating-systems

share|improve this question

asked yesterday

user997112user997112

10117

share|improve this question

asked yesterday

user997112user997112

10117

share|improve this question

asked yesterday

user997112user997112

10117

asked yesterday

user997112user997112

10117

asked yesterday

user997112user997112

10117