One of our clients has a problem with one or more OpenSSH processes consuming as much of a whole processor as they can get. The client is running IBM Ported Tools for z/OS - OpenSSH V1.2, primarily to transfer files using SFTP. Another server task in their architecture, which is attempting to manage the transfer of files to their customer gets an error condition (essentially an empty file). This server task takes an unknown action when this error occurs, and then the OpenSSH process starts consuming CPU as if it were going out of fashion. The correlation between the error being detected on the server task and the OpenSSH process going hot is too close on numerous days for there not to be a cause annd effect link here. The OpenSSH process will consume between 2300 and 4000 seconds of CPU (z196) for each error that is detected on the server task, so it's a major cost issue for the client. Taking APA traces of the OpenSSH does not really help. Any application code being run under the OpenSSH process is not usefully identified by APA. Does anyone have any technique for seeing under the covers for an OpenSSH process? Thanks Martyn -- Disclaimer:This email is for the use of the addressee only and may contain information that is confidential, privileged and/or subject to copyright. Any views expressed in this email communication are those of the individual sender, except where the sender specifically states them to be the views of CPT Global. CPT Global does not represent, warrant or guarantee that the integrity of this communication has been maintained or that the communication is free of errors, virus or interference. If you are not the intended recipient, you must not read, print, store, copy, forward or use this email for any reason, in accordance with privacy and copyright laws. If you have received this email in error, please notify the sender immediately and delete the email. Thank you.
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