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Gielovic  
#1 Posted : Tuesday, March 20, 2018 2:33:56 AM(UTC)
Gielovic

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Netherlands
Location: NL

When using the MailClient in a 'service-like' application where the operation can be paused and resumed, I would like to cleanup the MailClient. It does not release it's memory however. It seems like the MailInfo's (loaded with GetMailInfos()) are kept in memory. Simply creating a new instance and assigning it to a variable shows the same beviour.

I have tried using Close, Reset, and Quit but none of them seem to cleanup the memory. Also, there seems to be no documentation of what those operations intend to do exactly.

Any suggestions?

ivan  
#2 Posted : Thursday, March 22, 2018 5:06:20 PM(UTC)
ivan

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Hi, are you using .NET class? You don't have to clean the memory manually, because .NET will collect garbage automatically, if your memory is enough, the memory won't be collected immediately.
Gielovic  
#3 Posted : Friday, March 23, 2018 3:33:44 AM(UTC)
Gielovic

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Netherlands
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Yes I am using the .NET class. There appears to be some memory leak however. Perhaps some static reference holds on to some cached list of mailitems?.

Code:
                
/* Setup the server. */
oServer = new MailServer(settings);
/* Setup the client. */
oClient = new MailClient("key");
oClient.Connect(oServer);
var infos = oClient.GetMailInfos();
infos = null;
oClient.Quit(); oClient.Close();
// if garbage collection happens, we would expect the memory with al > 50.000 mailitems to be freed. 
oClient = new MailClient("key");
oClient.Connect(oServer);
var infos = oClient.GetMailInfos();
// at this moment, the memory footprint is doubled.


If we would do this multiple times (which is a realistic scenario if a service gets stopped and started several times), the memory used will only increase overtime.
ivan  
#4 Posted : Friday, March 23, 2018 5:51:20 PM(UTC)
ivan

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There is a list in MailClient to keep the MailInfo cache, but MailClient will free it automatically, but .NET GC doesn't work like Native C++, it doesn't free the memory immediately.

I just did a test like this:

Code:

for (int i = 0; i < 1000; i++)
{
    var server = new MailServer("server address", "user", "password", ServerProtocol.Imap4);
    server.SSLConnection = true; // i also tested other protocols.
    server.Port = 993;
    var client = new MailClient("TryIt");
    client.Connect(server);
    var infos = client.GetMailInfos(); // here is 87940 emails
    Console.WriteLine("Total {0} {1} emails", i, infos.Length);
    client.Quit();
    
    // Collect all generations of memory.
    GC.Collect();
    Console.WriteLine("Memory used after full collection:   {0:N0}",
                        GC.GetTotalMemory(true));

}


here is output, from the output, GetMailInfo doesn't have memory leak, i also reviewed the source codes, it used pure manage resource in GetMailInfos.
Code:

Total 17 87940 emails
Memory used after full collection:   41,091,104
Total 18 87940 emails
Memory used after full collection:   41,090,640
Total 19 87940 emails
Memory used after full collection:   41,091,104
Total 20 87940 emails
Memory used after full collection:   41,091,104
Total 21 87940 emails
Memory used after full collection:   41,091,128
Total 22 87940 emails
Memory used after full collection:   41,091,104
Total 23 87940 emails
Memory used after full collection:   41,091,128
Total 24 87940 emails
Memory used after full collection:   41,091,104
Total 25 87940 emails
Memory used after full collection:   41,091,592
Total 26 87940 emails
Memory used after full collection:   41,091,128
Total 27 87940 emails
Memory used after full collection:   41,091,104
Total 28 87940 emails
Memory used after full collection:   41,090,640


If i don't use GC.Collect(); it used about 48MB - 160MB, but it never exceed to upper bound, hope this could be helpful to you.

Edited by user Friday, March 23, 2018 7:13:28 PM(UTC)  | Reason: Not specified

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