Two great #WomenInSTEM: Computer scientist Katie Bouman and Margaret Hamilton.

Katie with her awesome stack of hard drives for #EHTBlackhole image data 😍.

Margaret and her Apollo Guidance Computer source code 📚.

@moiety wow, hard drive capacity sure has increased since last time I looked

I didn't think 5 petabytes would fit on a desk

@ben 1,6 PiB per stack, 200 TiB per disk 😱.

@carbontwelve @ben I’m not sure they are. The largest commercial ones I know are 16 TB.

I just divided the data by the number of stacks and the number of disks.

I don’t know enough about the disks/arrays themselves to comment any further.


@moiety @carbontwelve @ben the storage system is described in paper II, open access. page 8. on each telescope there are 4 signal chains. each chain is recording at 16Gbps over dual 10gigE writing to 32 HDDs in parallel. So 128 HDDs per telescope in all. 6-10 TB helium filled disks. Total data size of 1-2 PB per telescope, so I guess that's just one telescope's data on the desk.
The data is formatted as VDIF packets, so while it may be split into different files on the disks it can be reconstructed into the full stream.

@eqe @moiety @carbontwelve

that's still 64 megabytes being written per second to each hard drive, which is really impressive, but I guess you can get to that level if you're not reading anything from the drives during the entire process

@eqe @moiety @carbontwelve

This is what happens every time I see something cool.

Like when I saw this cutscene where everyone was amazed by the story going on or the graphics and I was just sitting here going "this is clearly a pre-rendered cutscene, and my character appears in it, so they're definitely doing something very sneaky here and I need to know what it is".

@eqe thank you for sharing the link. It made for fascinating reading. @ben @moiety
Sign in to participate in the conversation

Generalistic Mastodon instance for open-minded people. Instance Mastodon généraliste pour personnes ouvertes d'esprit.