SimGrid  3.18
Versatile Simulation of Distributed Systems
examples/s4u/io-file-system/s4u-io-file-system.cpp
/* Copyright (c) 2006-2017. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
#include <string>
#include <unordered_map>
#include "simgrid/s4u.hpp"
#include "src/plugins/file_system/FileSystem.hpp"
XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_test, "a sample log category");
class MyHost {
public:
void show_info(std::unordered_map<std::string, simgrid::s4u::Storage*> const& mounts)
{
XBT_INFO("Storage info on %s:", simgrid::s4u::Host::current()->getCname());
for (auto const& kv : mounts) {
std::string mountpoint = kv.first;
simgrid::s4u::Storage* storage = kv.second;
// Retrieve disk's information
XBT_INFO(" %s (%s) Used: %llu; Free: %llu; Total: %llu.", storage->getCname(), mountpoint.c_str(),
}
}
void operator()()
{
std::unordered_map<std::string, simgrid::s4u::Storage*> const& mounts =
show_info(mounts);
// Open an non-existing file to create it
std::string filename = "/home/tmp/data.txt";
simgrid::s4u::File* file = new simgrid::s4u::File(filename, nullptr);
sg_size_t write = file->write(200000); // Write 200,000 bytes
XBT_INFO("Create a %llu bytes file named '%s' on /sd1", write, filename.c_str());
// check that sizes have changed
show_info(mounts);
// Now retrieve the size of created file and read it completely
const sg_size_t file_size = file->size();
file->seek(0);
const sg_size_t read = file->read(file_size);
XBT_INFO("Read %llu bytes on %s", read, filename.c_str());
// Now write 100,000 bytes in tmp/data.txt
write = file->write(100000); // Write 100,000 bytes
XBT_INFO("Write %llu bytes on %s", write, filename.c_str());
// Now rename file from ./tmp/data.txt to ./tmp/simgrid.readme
std::string newpath = "/home/tmp/simgrid.readme";
XBT_INFO("Move '%s' to '%s'", file->getPath(), newpath.c_str());
file->move(newpath);
// Test attaching some user data to the file
file->setUserdata(new std::string("777"));
std::string* file_data = static_cast<std::string*>(file->getUserdata());
XBT_INFO("User data attached to the file: %s", file_data->c_str());
delete file_data;
// Close the file
delete file;
// Now attach some user data to disk1
XBT_INFO("Get/set data for storage element: %s", storage->getCname());
XBT_INFO(" Uninitialized storage data: '%s'", static_cast<char*>(storage->getUserdata()));
storage->setUserdata(new std::string("Some user data"));
std::string* storage_data = static_cast<std::string*>(storage->getUserdata());
XBT_INFO(" Set and get data: '%s'", storage_data->c_str());
delete storage_data;
// Reopen the file and then unlink it
file = new simgrid::s4u::File("/home/tmp/simgrid.readme", nullptr);
XBT_INFO("Unlink file: '%s'", file->getPath());
file->unlink();
delete file; // Unlinking the file on "disk" does not free the object
show_info(mounts);
}
};
int main(int argc, char** argv)
{
simgrid::s4u::Engine e(&argc, argv);
e.loadPlatform(argv[1]);
e.run();
return 0;
}