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--- hpc:faq [2025/10/28 14:38] – [Storage] Adrien Albert
+++ hpc:faq [2026/02/02 10:15] (current) – [Cost] Yann Sagon
@@ Line 38: / Line 38: @@
 =?=== Cost ====
+??? I'm using Open XDMoD to check how many hours my group used this year, but the amount is quite different from what appears on the invoice or in ''ug_slurm_usage_per_user.py''.
+!!! For invoicing, we use a Slurm metric called billing. This metric aggregates CPU hours, memory usage, and GPU usage. Unfortunately, Open XDMoD does not currently support this metric and therefore does not take into account GPU type or memory usage. We have added a warning about this in [[accounting#openxdmod|Open XDMoD documentation]]
+??? My group only used our private partition. I heard from a colleague that it is free of charge, yet I still received an invoice.
+!!! Because GPU models and RAM usage vary significantly, we now apply a uniform resource accounting system by converting GPU hours and memory usage into CPU-hour equivalents.
+This metric is called billing. If you own a private partition, you receive a fixed annual allocation of billing units that can be used on any cluster. More details are available here: [[accounting#resources_available_for_research_group|Resources available for research groups]]
+??? Your documentation states the cost per hour is 0.0157 CHF, but my invoice shows 0.02 CHF.
+!!! The price per hour shown on the invoice is rounded for display purposes only. The actual calculation uses the full precision of the rate.
+??? I'm a PI and want to see usage details per user.
+!!! You can use the script ''ug_slurm_usage_per_user.py'' for this purpose. An example is provided in our documentation: Aggregate usage by all users of a given PI. [[accounting#aggregate_usage_by_all_users_of_a_given_pi|Aggregate usage by all users of a given PI]]
 ??? I have no idea why I received your email about 'HPC billing'.
@@ Line 109: / Line 123: @@
 ??? I'm a user and I've noticed that I'm connected to two PIs, how is this possible?
 !!! The PI must be seen as a project. You can be part of two projects, and when you submit a job to the cluster, you can specify which project to charge to using the ''<nowiki>--account</nowiki>'' flag.
+You can check who is your PI and which is your default account with the following command:
+<code>
+sacctmgr show user <your_username> -s format=user,account,defaultaccount cluster=baobab
+      User    Account   Def Acct
+---------- ---------- ----------
+  username acct1       xxx
+  username acct2       xxx
+</code>
@@ Line 273: / Line 295: @@
 To request a shared directory please fill the [[https://dw.unige.ch/openentry.html?tid=hpc | HPC form]] on DW.
+(For Oustsider please refer to your PI/repondant)
 ??? How can I access to a shared directory?
 !!! To access a **shared directory**, you need to be added to the appropriate group.
-For shared directories using a group from Active Directory (groups beginning with GG or GL - example: GL_S_SCIENCES_POSY_LET, please use the [[https://dw.unige.ch/openentry.html?tid=adaccess|ADaccess form]] on DW.
+For shared directories using a group from Active Directory (groups beginning with GG or GL - example: GL_S_SCIENCES_POSY_LET, please contact your CI (Correspondant Informatique) or use the [[https://dw.unige.ch/openentry.html?tid=adaccess|ADaccess form]] on DW.
 For old group (share_XXX, private_XXX), please send an email to [[hpc@unige.ch]] including relevant information (Uusername, Group, private_partion etc...) with the responsible person for the share or partition in CC. The responsible person **must** approve the modification.