ram

问题 My application needs to read like thousands of lines from a large csv file around 300GB with billion lines, each line contains several numbers. The data are like these: 1, 34, 56, 67, 678, 23462, ... 2, 3, 6, 8, 34, 5 23,547, 648, 34657 ... ... ... I tried fget reading file line by line in c, but it took really really really long, even with wc -l in linux, just to read all of the line, it took quite a while. I also tried to write all data to sqlite3 database based on the logics of the

问题 My application needs to read like thousands of lines from a large csv file around 300GB with billion lines, each line contains several numbers. The data are like these: 1, 34, 56, 67, 678, 23462, ... 2, 3, 6, 8, 34, 5 23,547, 648, 34657 ... ... ... I tried fget reading file line by line in c, but it took really really really long, even with wc -l in linux, just to read all of the line, it took quite a while. I also tried to write all data to sqlite3 database based on the logics of the

问题 I have a program that, when queried on initialisation, is immediately using > 2 GB of RAM. Basically the code is like this: #include <blah> int main() { cout << get_mem_usage() << endl; //Lots of things happen, but no significant memory usage return 0; } Output: [2013-02-15 18:38:05.865283] 2147.71 Mb I am, however, linking to a lot of different shared object files: I checked ldd and I am linking to 58 libraries, with a combined .so size of 66 MB. I'm pretty sure that the get_mem_usage

问题 I have a program that, when queried on initialisation, is immediately using > 2 GB of RAM. Basically the code is like this: #include <blah> int main() { cout << get_mem_usage() << endl; //Lots of things happen, but no significant memory usage return 0; } Output: [2013-02-15 18:38:05.865283] 2147.71 Mb I am, however, linking to a lot of different shared object files: I checked ldd and I am linking to 58 libraries, with a combined .so size of 66 MB. I'm pretty sure that the get_mem_usage

问题 If I have 16 GB of RAM on my machine, how much can I allocate to a java command line program I'm executing? I assume java -Xmx 16g... will crash my system? EDIT: In light of the comments, I tried java -Xmx16g... , and it did not crash my machine. The program still ran out of memory. I tried java -Xmx32g... , which did crash my machine. From the comments below (which have been really enlightening), I guess I just need to keep playing around with the allocations. 回答1: The size the heap memory

问题 We would be using Virtuoso for storing RDFs, the triple count will be 100 million to start with. I need to know what should be typical RAM, CPU, Disk etc for this. Querying will be with SPARQL and there will be a bit complex queries. Kindly provide your inputs. 回答1: The average size of a Virtuoso version 6.x triple (quad) is about 30bytes thus for 100 million triples you would need about 3GB RAM , this being the most critical component to enable the database working set to fit in memory ,

问题 I'm working on a C++ application which is keeping some user secret keys in the RAM. This secret keys are highly sensitive & I must minimize risk of any kind of attack against them. I'm using a character array to store these keys, I've read some contents about storing variables in CPU registers or even CPU cache (i.e using C++ register keyword), but seems there is not a guaranteed way to force application to store some of it's variables outside of RAM (I mean in CPU registers or cache). Can

问题 I'm working on a C++ application which is keeping some user secret keys in the RAM. This secret keys are highly sensitive & I must minimize risk of any kind of attack against them. I'm using a character array to store these keys, I've read some contents about storing variables in CPU registers or even CPU cache (i.e using C++ register keyword), but seems there is not a guaranteed way to force application to store some of it's variables outside of RAM (I mean in CPU registers or cache). Can

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 months ago . Improve this question So, I have a java jar to run on my raspberry pi, and it requires a lot of memory. I have set up 2 gb swap on an external usb flash drive. But when I start the jar with -Xmx2048M, it says that it could not reserve enough space for 2097152KB object heap. I know

问题 I didn't find a suggestion on how much RAM I actually should allocate to the JVM. Assuming that my computer has 4GB RAM and runs Windows 10. I nearly only use Java Applications on it. With how much RAM should I start the JVM? The system needs RAM for itself too, so in my logic, I should not allocate 4 GB even if that is possible. This isn't a black/white question, I just want to have an idea and how to come to an answer in this question. 回答1: I didn't find a suggestion on how much RAM I