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ffmpeg azure function consumption plan low CPU availability for high volume requests
27 novembre 2017, par The LemonI am running an azure queue function on a consumption plan ; my function starts an FFMpeg process and accordingly is very CPU intensive. When I run the function with less than 100 items in the queue at once it works perfectly, azure scales up and gives me plenty of servers and all of the tasks complete very quickly. My problem is once I start doing more than 300 or 400 items at once, it starts fine but after a while the CPU slowly goes from 80% utilisation to only around 10% utilisation - my functions cant finish in time with only 10% CPU. This can be seen in the image shown below.
Does anyone know why the CPU useage is going lower the more instances my function creates ? Thanks in advance Cuanedit : the function is set to only run one at a time per instance, but the problem exists when set to 2 or 3 concurrent processes per instance in the host.json
edit : the CPU drops get noticeable at 15-20 servers, and start causing failures at around 60. After that the CPU bottoms out at an average of 8-10% with individuals reaching 0-3%, and the server count seems to increase without limit (which would be more helpful if I got some CPU with the servers)
Thanks again, Cuan.
I’ve also added the function code to the bottom of this post in case it helps.
using System.Net;
using System;
using System.Diagnostics;
using System.ComponentModel;
public static void Run(string myQueueItem, TraceWriter log)
{
log.Info($"C# Queue trigger function processed a request: {myQueueItem}");
//Basic Parameters
string ffmpegFile = @"D:\home\site\wwwroot\CommonResources\ffmpeg.exe";
string outputpath = @"D:\home\site\wwwroot\queue-ffmpeg-test\output\";
string reloutputpath = "output/";
string relinputpath = "input/";
string outputfile = "video2.mp4";
string dir = @"D:\home\site\wwwroot\queue-ffmpeg-test\";
//Special Parameters
string videoFile = "1 minute basic.mp4";
string sub = "1 minute sub.ass";
//guid tmp files
// Guid g1=Guid.NewGuid();
// Guid g2=Guid.NewGuid();
// string f1 = g1 + ".mp4";
// string f2 = g2 + ".ass";
string f1 = videoFile;
string f2 = sub;
//guid output - we will now do this at the caller level
string g3 = myQueueItem;
string outputGuid = g3+".mp4";
//get input files
//argument
string tmp = subArg(f1, f2, outputGuid );
//String.Format("-i \"" + @"input/tmp.mp4" + "\" -vf \"ass = '" + sub + "'\" \"" + reloutputpath +outputfile + "\" -y");
log.Info("ffmpeg argument is: "+tmp);
//startprocess parameters
Process process = new Process();
process.StartInfo.FileName = ffmpegFile;
process.StartInfo.Arguments = tmp;
process.StartInfo.UseShellExecute = false;
process.StartInfo.RedirectStandardOutput = true;
process.StartInfo.RedirectStandardError = true;
process.StartInfo.WorkingDirectory = dir;
//output handler
process.OutputDataReceived += new DataReceivedEventHandler(
(s, e) =>
{
log.Info("O: "+e.Data);
}
);
process.ErrorDataReceived += new DataReceivedEventHandler(
(s, e) =>
{
log.Info("E: "+e.Data);
}
);
//start process
process.Start();
log.Info("process started");
process.BeginOutputReadLine();
process.BeginErrorReadLine();
process.WaitForExit();
}
public static void getFile(string link, string fileName, string dir, string relInputPath){
using (var client = new WebClient()){
client.DownloadFile(link, dir + relInputPath+ fileName);
}
}
public static string subArg(string input1, string input2, string output1){
return String.Format("-i \"" + @"input/" +input1+ "\" -vf \"ass = '" + @"input/"+input2 + "'\" \"" + @"output/" +output1 + "\" -y");
}