13 #include <sys/types.h>
17 #include "usdt_sample_lib1/lib1.h"
19 void print_usage(int argc, char** argv)
21 std::cout << "Usage:" << std::endl;
23 << " <InputPrefix> <InputMinimum (1-50)> <InputMaximum (1-50)> <CallsPerSec (1-50)> <MinimumLatencyMs (1-50)> <MaximumLatencyMs (1-50)>"
25 std::cout << "InputPrefix: Prefix of the input string to the operation. Default: dummy" << std::endl;
26 std::cout << "InputMinimum: Minimum number to make the input string to the operation somewhat unique. Default: 1" << std::endl;
27 std::cout << "InputMaximum: Maximum number to make the input string to the operation somewhat unique. Default: 50" << std::endl;
28 std::cout << "CallsPerSec: Rate of calls to the operation. Default: 10" << std::endl;
29 std::cout << "MinimumLatencyMs: Minimum latency to apply to the operation. Default: 20" << std::endl;
30 std::cout << "MaximumLatencyMs: Maximum latency to apply to the operation. Default: 40" << std::endl;
33 int main(int argc, char** argv)
35 std::string inputPrefix("dummy");
36 std::uint32_t inputMinimum = 1;
37 std::uint32_t inputMaximum = 50;
38 std::uint32_t callsPerSec = 10;
39 std::uint32_t minLatMs = 20;
40 std::uint32_t maxLatMs = 40;
44 inputPrefix = argv[1];
48 inputMinimum = static_cast<std::uint32_t>(std::max(1, std::min(50, std::atoi(argv[2]))));
52 inputMaximum = static_cast<std::uint32_t>(std::max(1, std::min(50, std::atoi(argv[3]))));
56 callsPerSec = static_cast<std::uint32_t>(std::max(1, std::min(50, std::atoi(argv[4]))));
60 minLatMs = static_cast<std::uint32_t>(std::max(1, std::min(50, std::atoi(argv[5]))));
64 maxLatMs = static_cast<std::uint32_t>(std::max(1, std::min(50, std::atoi(argv[6]))));
67 catch (const std::exception& exc) {
68 std::cout << "Exception while reading arguments: " << exc.what() << std::endl;
69 print_usage(argc, argv);
73 std::cout << "Unknown exception while reading arguments." << std::endl;
74 print_usage(argc, argv);
78 if (inputMinimum > inputMaximum) {
79 std::cout << "InputMinimum must be smaller than InputMaximum." << std::endl;
80 print_usage(argc, argv);
84 if (minLatMs > maxLatMs) {
85 std::cout << "MinimumLatencyMs must be smaller than MaximumLatencyMs." << std::endl;
86 print_usage(argc, argv);
90 std::cout << "Applying the following parameters:" << std::endl
91 << "Input prefix: " << inputPrefix << "." << std::endl
92 << "Input range: [" << inputMinimum << ", " << inputMaximum << "]." << std::endl
93 << "Calls Per Second: " << callsPerSec << "." << std::endl
94 << "Latency range: [" << minLatMs << ", " << maxLatMs << "] ms." << std::endl;
96 const int sleepTimeMs = 1000 / callsPerSec;
97 OperationProvider op(minLatMs, maxLatMs);
99 std::mutex queueMutex;
100 std::queue<std::shared_future<OperationResponse>> responseQueue;
102 auto dequeueFuture = std::async(std::launch::async, [&]() {
106 std::lock_guard<std::mutex> lg(queueMutex);
107 empty = responseQueue.empty();
111 std::this_thread::sleep_for(std::chrono::milliseconds(sleepTimeMs));
115 responseQueue.front().get();
117 // std::cout << "Removing item from queue." << std::endl;
118 std::lock_guard<std::mutex> lg(queueMutex);
123 std::random_device rd;
124 std::uniform_int_distribution<> dis(inputMinimum, inputMaximum);
126 std::cout << "You can now run the bcc scripts, see usdt_sample.md for examples." << std::endl;
127 std::cout << "pid: " << ::getpid() << std::endl;
128 std::cout << "Press ctrl-c to exit." << std::endl;
130 std::ostringstream inputOss;
131 inputOss << inputPrefix << "_" << dis(rd);
132 auto responseFuture = op.executeAsync(OperationRequest(inputOss.str()));
135 std::lock_guard<std::mutex> lg(queueMutex);
136 responseQueue.push(responseFuture);
139 // For a sample application, this is good enough to simulate callsPerSec.
140 std::this_thread::sleep_for(std::chrono::milliseconds(sleepTimeMs));