Update effective time calibration

[dkirkby]

From @schlafly:

There has been a fluctuation in the value of EFFTIME_SPEC / EFFTIME_ETC such that we're now averaging something like 0.95.  We stayed at 1 between the two major shutdowns but have been at ~0.95 since then.
...
Let's go ahead and boost the amount of time we get given a particular requested time by 5%.
The goal is that exposure times after this tweak will be 5% longer than they otherwise would have been.

[dkirkby]

The simplest way to accomplish this is to adjust the default scale parameter of accum.get_efftime which is currently set to 1.11537 after #4. Multiplying this by 1.05 gives 1.17114.

[schlafly]

@dkirkby , can you confirm the intended sign here? We wanted to make exposures 5% longer. We have been undercooking tiles since restart; if we applied this with the wrong sign that would go a long way to explaining the current issue.

[dkirkby]

Arrgh, I got this backwards and increased EFFTIME_ETC by 5%.

The correct scale value to use is 1.11537 * 0.95 = 1.05960. I have fixed this in the code now and tagged 0.1.16.

[schlafly]

Thank you! Any idea how the installation in the ICS environment works? Do we need to wait for Klaus's return? Especially challenging at the moment with the network down.

[schlafly]

Sorry, I see on Slack that you already resolved this; thanks!

[daqiii]

We just patched the file. As you know there is no access to external sites possible. The next attempt is currently being made by Bob. If it works Ann will let you (Eddie) know. Klaus From: Eddie Schlafly ***@***.***> Date: Friday, August 11, 2023 at 1:34 PM To: desihub/desietc ***@***.***> Cc: Subscribed ***@***.***> Subject: Re: [desihub/desietc] Update effective time calibration (Issue #11) Thank you! Any idea how the installation in the ICS environment works? Do we need to wait for Klaus's return? Especially challenging at the moment with the network down. — Reply to this email directly, view it on GitHub, or unsubscribe. You Thank you! Any idea how the installation in the ICS environment works? Do we need to wait for Klaus's return? Especially challenging at the moment with the network down. — Reply to this email directly, view it on GitHub<https://urldefense.com/v3/__https:/github.com/desihub/desietc/issues/11*issuecomment-1675146151__;Iw!!KGKeukY!xBK6xXBk5TaW4AeJ5grAuZbhYPEOmr4JZdRlKmbT_t2goNQDtlOmO5iujjHGbFIs6-pgkqelGjQhD__Fzip9spzEPw$>, or unsubscribe<https://urldefense.com/v3/__https:/github.com/notifications/unsubscribe-auth/ABQ5P63AEHUDTZDNDWAFMZDXUZULTANCNFSM6AAAAAA26VSHQM__;!!KGKeukY!xBK6xXBk5TaW4AeJ5grAuZbhYPEOmr4JZdRlKmbT_t2goNQDtlOmO5iujjHGbFIs6-pgkqelGjQhD__FzioxK0vzhQ$>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>