smap | DLL scatter manual mapper

by btbd C++ Version: Current License: No License

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | smap Summary

smap is a C++ library. smap has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

DLL scatter manual mapper

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Support

smap has a low active ecosystem.

It has 536 star(s) with 139 fork(s). There are 20 watchers for this library.

It had no major release in the last 6 months.

smap has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of smap is current.

Quality

smap has 0 bugs and 0 code smells.

Security

smap has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

smap code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

smap does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

Reuse

smap releases are not available. You will need to build from source code and install.

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smap Key Features

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smap Examples and Code Snippets

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Community Discussions

Trending Discussions on smap

Sequentually subtract each value in a vector from all values in another vector

C function for combining an array of strings into a single string in a loop and return the string after freeing the allocated memory

Permission denied while reading /proc/pid/smaps file (golang)

Same compute intensive function running on two different cores resulting in different latency

Why does this program print characters repeatedly, when they only appear in heap memory once?

Puppeteer not working NodeJS 17 on Arch Linux

How can I run a process with CPU and another process with GPU?

How does -march native affect floating point accuracy?

when I click a project : 500 Whoops, something went wrong on our end

Convert list inside pandas dataframe to list variable

QUESTION

Sequentually subtract each value in a vector from all values in another vector

Asked 2022-Apr-14 at 11:26

I have a list of all CpG locations (base pair value) for a gene on a methylation array in one table (table a), and another table with the locations (base pair value) for 12 CpGs for the same gene not present on the array (table b). I am trying to work out for each probe in table_b, which probe in table_a is the closest in bp.

i.e. table_a

...

ANSWER

Answered 2022-Apr-14 at 11:26

Joining is equivalent to filtering the cross-product. We can sort all combinations of rows from both tables to pick the one with the closest distance:

Source https://stackoverflow.com/questions/71870480

QUESTION

C function for combining an array of strings into a single string in a loop and return the string after freeing the allocated memory

Asked 2022-Mar-18 at 07:54

I'm working on a procfs kernel extension for macOS and trying to implement a feature that emulates Linux’s /proc/cpuinfo similar to what FreeBSD does with its linprocfs. Since I'm trying to learn, and since not every bit of FreeBSD code can simply be copied over to XNU and be expected to work right out of the jar, I'm writing this feature from scratch, with FreeBSD and NetBSD's linux-based procfs features as a reference. Anyways...

Under Linux, $cat /proc/cpuinfo showes me something like this:

...

ANSWER

Answered 2022-Mar-18 at 07:54

There is no need to allocate memory for this task: pass a pointer to a local array along with its size and use strlcat properly:

Source https://stackoverflow.com/questions/71518714

QUESTION

Permission denied while reading /proc/pid/smaps file (golang)

Asked 2022-Mar-05 at 17:54

Using the os/exec package, I want to run an external command on a *nix OS with another user instead of root. (The main process runs under root user).

The external command runs by go app. But my app can not read /proc/pid/smaps file, following error:

...

ANSWER

Answered 2022-Mar-05 at 17:54

I test my code inside a docker container that doesn't have SYS_PTRACE capability. That's why the error shows. The error was gone when I added the SYS_PTRACE capability for that container.

Source https://stackoverflow.com/questions/71349024

QUESTION

Same compute intensive function running on two different cores resulting in different latency

Asked 2022-Jan-13 at 08:40

#include 
#include 
#include 

#include 
#include 

using namespace std;

static inline void stick_this_thread_to_core(int core_id);
static inline void* incrementLoop(void* arg);

struct BenchmarkData {
    long long iteration_count;
    int core_id;
};

pthread_barrier_t g_barrier;

int main(int argc, char** argv)
{
    if(argc != 3) {
        cout << "Usage: ./a.out  " << endl;
        return EXIT_FAILURE;
    }

    cout << "================================================ STARTING ================================================" << endl;

    int core1 = std::stoi(argv[1]);
    int core2 = std::stoi(argv[2]);

    pthread_barrier_init(&g_barrier, nullptr, 2);

    const long long iteration_count = 100'000'000'000;

    BenchmarkData benchmark_data1{iteration_count, core1};
    BenchmarkData benchmark_data2{iteration_count, core2};

    pthread_t worker1, worker2;
    pthread_create(&worker1, nullptr, incrementLoop, static_cast(&benchmark_data1));
    cout << "Created worker1" << endl;
    pthread_create(&worker2, nullptr, incrementLoop, static_cast(&benchmark_data2));
    cout << "Created worker2" << endl;

    pthread_join(worker1, nullptr);
    cout << "Joined worker1" << endl;
    pthread_join(worker2, nullptr);
    cout << "Joined worker2" << endl;

    return EXIT_SUCCESS;
}

static inline void stick_this_thread_to_core(int core_id) {
    int num_cores = sysconf(_SC_NPROCESSORS_ONLN);
    if (core_id < 0 || core_id >= num_cores) {
        cerr << "Core " << core_id << " is out of assignable range.\n";
        return;
    }

    cpu_set_t cpuset;
    CPU_ZERO(&cpuset);
    CPU_SET(core_id, &cpuset);

    pthread_t current_thread = pthread_self();

    int res = pthread_setaffinity_np(current_thread, sizeof(cpu_set_t), &cpuset);

    if(res == 0) {
        cout << "Thread bound to core " << core_id << " successfully." << endl;
    } else {
        cerr << "Error in binding this thread to core " << core_id << '\n';
    }
}

static inline void* incrementLoop(void* arg)
{
    BenchmarkData* arg_ = static_cast(arg);
    int core_id = arg_->core_id;
    long long iteration_count = arg_->iteration_count;

    stick_this_thread_to_core(core_id);

    cout << "Thread bound to core " << core_id << " will now wait for the barrier." << endl;
    pthread_barrier_wait(&g_barrier);
    cout << "Thread bound to core " << core_id << " is done waiting for the barrier." << endl;

    long long data = 0; 
    long long i;

    cout << "Thread bound to core " << core_id << " will now increment private data " << iteration_count / 1'000'000'000.0 << " billion times." << endl;
    std::chrono::steady_clock::time_point begin = std::chrono::steady_clock::now();
    for(i = 0; i < iteration_count; ++i) {
        ++data;
        __asm__ volatile("": : :"memory");
    }

    std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();
    unsigned long long elapsed_time = std::chrono::duration_cast(end - begin).count();

    cout << "Elapsed time: " << elapsed_time << " ms, core: " << core_id << ", iteration_count: " << iteration_count << ", data value: " << data << ", i: " << i << endl;

    return nullptr;
}

...

ANSWER

Answered 2022-Jan-13 at 08:40

It turns out that cores 0, 16, 17 were running at much higher frequency on my Skylake server.

Source https://stackoverflow.com/questions/70668229

QUESTION

Why does this program print characters repeatedly, when they only appear in heap memory once?

Asked 2021-Dec-31 at 23:21

I wrote a small program to explore out-of-bounds reads vulnerabilities in C to better understand them; this program is intentionally buggy and has vulnerabilities:

...

ANSWER

Answered 2021-Dec-31 at 23:21

Since stdout is line buffered, putchar doesn't write to the terminal directly; it puts the character into a buffer, which is flushed when a newline is encountered. And the buffer for stdout happens to be located on the heap following your heap_book allocation.

So at some point in your copy, you putchar all the characters of your secretinfo method. They are now in the output buffer. A little later, heap_book[i] is within the stdout buffer itself, so you encounter the copy of secretinfo that is there. When you putchar it, you effectively create another copy a little further along in the buffer, and the process repeats.

You can verify this in your debugger. The address of the stdout buffer, on glibc, can be found with p stdout->_IO_buf_base. In my test it's exactly 160 bytes past heap_book.

Source https://stackoverflow.com/questions/70545319

QUESTION

Puppeteer not working NodeJS 17 on Arch Linux

Asked 2021-Nov-28 at 07:25

I've started working with Puppeteer and for some reason I cannot get it to work on my box. This error seems to be a common problem (SO1, SO2) but all of the solutions do not solve this error for me. I have tested it with a clean node package (see reproduction) and I have taken the example from the official Puppeteer 'Getting started' webpage.

How can I resolve this error?

Versions and hardware ...

ANSWER

Answered 2021-Nov-24 at 18:42

There's too much for me to put this in a comment, so I will summarize here. Maybe it will help you, or someone else. I should also mention this is for RHEL EC2 instances behind a corporate proxy (not Arch Linux), but I still feel like it may help. I had to do the following to get puppeteer working. This is straight from my docs, but I had to hand-jam the contents because my docs are on an intranet.

I had to install all of these libraries manually. I also don't know what the Arch Linux equivalents are. Some are duplicates from your question, but I don't think they all are:
pango libXcomposite libXcursor libXdamage libXext libXi libXtst cups-libs libXScrnSaver libXrandr GConf2 alsa-lib atk gtk3 ipa-gothic-fonts xorg-x11-fonts-100dpi xorg-x11-fonts-75dpi xorg-x11-utils xorg-x11-fonts-cyrillic xorg-x11-fonts-Type1 xorg-x11-fonts-misc liberation-mono-fonts liberation-narrow-fonts liberation-narrow-fonts liberation-sans-fonts liberation-serif-fonts glib2

If Arch Linux uses SELinux, you may also have to run this:
setsebool -P unconfirmed_chrome_sandbox_transition 0

It is also worth adding dumpio: true to your options to debug. Should give you a more detailed output from puppeteer, instead of the generic error. As I mentioned in my comment. I have this option ignoreDefaultArgs: ['--disable-extensions']. I can't tell you why because I don't remember. I think it is related to this issue, but also could be related to my corporate proxy.

Source https://stackoverflow.com/questions/70032857

QUESTION

How can I run a process with CPU and another process with GPU?

Asked 2021-Nov-16 at 10:57

In my script there are 5 different process which should work parallel. For now I am using multiprocessing pool method to run parallel processes. Actually it is working very well. But the problem is I want to use this script in a platform which has only 4 CPU. But this platform has also GPU (Nvidia Jetson Nano). So I want to run 4 process with CPUs and another one process should work with GPU. Let me explain with some code:

...

ANSWER

Answered 2021-Nov-16 at 10:17

GPU's cannot run Python. The actual object detection will be done in a non-Python function; likely a CUDA function (the native language of NVidia CPU's).

Since you have 4 CPU cores, the 5 threads will not run simultaneously. The "lock" code is also very suspect. In general, locks should be taken by the function that uses the variable, and the locks will prevent conflicts between multiple functions using the same variable. This requires that each function has a separate lock. counter_lock_1 outside any of the 5 process functions is likely in the wrong place.

Source https://stackoverflow.com/questions/69986301

QUESTION

How does -march native affect floating point accuracy?

Asked 2021-Nov-15 at 11:50

The code I work on has a substantial amount of floating point arithmetic in it. We have test cases that record the output for given inputs and verify that we don't change the results too much. I had it suggested that I enable -march native to improve performance. However, with that enabled we get test failures because the results have changed. Do the instructions that will be used because of access to more modern hardware enabled by -march native reduce the amount of floating point error? Increase the amount of floating point error? Or a bit of both? Fused multiply add should reduce the amount of floating point error but is that typical of instructions added over time? Or have some instructions been added that while more efficient are less accurate?

The platform I am targeting is x86_64 Linux. The processor information according to /proc/cpuinfo is:

...

ANSWER

Answered 2021-Nov-15 at 09:40

-march native means -march $MY_HARDWARE. ~~We have no idea what hardware you have.~~ For you, that would be -march=skylake-avx512 (SkyLake SP) The results could be reproduced by specifying your hardware architecture explicitly.

It's quite possible that the errors will decrease with more modern instructions, specifically Fused-Multiply-and-Add (FMA). This is the operation a*b+c, but rounded once instead of twice. That saves one rounding error.

Source https://stackoverflow.com/questions/69971612

QUESTION

when I click a project : 500 Whoops, something went wrong on our end

Asked 2021-Oct-28 at 16:29

hellow every one i migrated gitlab-ce into a new instance with new domain name using backup/restore

my problem : when i click a project it gives me "500 Whoops, something went wrong on our end "

i installed the same gitlab-ce version in the new host which is 13.6.2

my gitlab status

...

ANSWER

Answered 2021-Oct-28 at 16:29

To fix this problem I had to migrate gitlab-secrets.json from /etc/gitlab too, because this file contains the database encryption key, CI/CD variables, and variables used for two-factor authentication.
If you fail to restore this encryption key file along with the application data backup, users with two-factor authentication enabled and GitLab Runner lose access to your GitLab server.

Source https://stackoverflow.com/questions/69525251

QUESTION

Convert list inside pandas dataframe to list variable

Asked 2021-Oct-02 at 11:44

I have a .csv file structured as well:

...

ANSWER

Answered 2021-Oct-02 at 11:44

Not sure how you want to present your output, but if you want to convert your string into list of integers list, just do:

Source https://stackoverflow.com/questions/69416424

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install smap

You can download it from GitHub.

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For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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