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Vijay Chidambaram @vj_chidambaram
, 6 tweets, 2 min read Read on Twitter
Folks heading to #atc18 check out our work on TxFS, the Texas Transactional File System!

cs.utexas.edu/~vijay/papers/…

We built TxFS in only 5K LOC by utilizing the file-system journal to get atomic and durable transactions.
Providing isolation for TxFS transactions was a hard problem. We customized isolation to each kernel data structure. For data structures like pages which have a narrow access interface, we provide eager conflict detection.
For inodes and dentries which are modified all over the place, we add a timestamp which captures modifications, and provide timestamp-based conflict detection.
One problem with allowing concurrent transactions is that they all modify global data structures like bitmaps and super blocks. We solve this problem by deferring global updates until commit/abort, while allowing the local updates within the transaction.
TxFS has a simple interface, with only three system calls: tx_begin(), tx_commit(), and tx_abort(). All file-system operations within tx_begin() and tx_commit() become part of the transaction. We ported SQLite, Android Mail, and Git to use TxFS transactions.
The code for TxFS is available at github.com/ut-osa/txfs
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More from @vj_chidambaram see all

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This is false and harmful. It projects “good” programmers as people who do it for fun: competence has nothing to do with this, and plenty of programmers with families see it as a job, and they are excellent at what they do.
People who program a lot for fun without getting paid are basically privileged ("I am rich so I don't have to work for money"). Lots of talented, competent people can't do this because jobs or kids or friends take up their time: doesn't mean they aren't good!
Just because I am good at programming doesn't mean I have to spend every waking minute doing so. Folks can choose to have a healthy social life and program only during their jobs: this is normal and healthy!
Read 3 tweets
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Some believe that writing a scientific paper is a dry process, devoid of creativity.

Nothing could be further from the truth!

Writing a paper is more like making a movie! If you are the lead author/prof, you are the director of the movie.
Just as with a movie, a scientific paper starts with a vision. Not all the details have been worked out, but a high-level idea is there, and you are excited about the final product once it is done.

You then start putting together the paper/movie piece by piece.
Just as a director works with lots of people to make the movie, there is often a team of graduate students working with the lead author/prof to create the paper. Leading this team correctly is part of realizing the vision.
Read 5 tweets
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This is an amazing series of interviews of successful professors by younger professors. There are all sorts of interesting tidbits and advice in here. Highly recommend all junior profs read this!
To highlight some of the interesting tidbits: (my paraphrasing) "You should fight like a dog. You have fought so hard to get here, don't give up now!"

"Its really an art to ask money for a squid!"

"Don't take on every student who comes your way"
On grant writing: "The motivation is the most important part. If they like your vision and get why you are excited, they will overlook many technical details"

I've heard this before, but its good to get it re-iterated
Read 5 tweets

Related threads

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✨💡 This is an ace idea from @sarah_edo! 💕

👩‍💻 Be on the lookout for a @TensorFlow Advent Calendar tomorrow, as well, highlighting meaningful, high-impact projects and papers from our community. If you'd like for yours to be considered, please shoot me an @-mention!
✨#TFadvent begins today! 😄

For our first project, I'd like to highlight this accessibility example from @shekitup that uses @TensorFlowJS to interpret sign language—and then translates those signs into input that can be used by a home assistant! 🗣️✨

medium.com/tensorflow/get…
🎁 Day #2 of #TFadvent:

🤖 Check out this project from a recent hackathon at @ColbyCollege! The team trained a @TensorFlow model to learn muscle movements, then used that model to send signals to a prosthetic arm, controlling one finger at a time. ✨

👉: m.facebook.com/notes/daviscon…
Read 32 tweets
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Hey #TEXAS #VotingMatters
Here’s a THREAD of All your Democratic Candidates
& Voting Info (Registration, Vote by Mail, Early Voting, being a Poll Worker with Links
Register by October 9 via here: votetexas.gov/register-to-vo…
Info at mytexasvotes.com & @VoteTexas
#Midterms2018
REGISTRATON in #TEXAS
Register to Vote by OCTOBER 9 #Midterms2018
Check you’re Registered teamrv-mvp.sos.texas.gov/MVP/mvp.do
Register here: webservices.sos.state.tx.us/vrapp/index.asp
Voting Officials here: sos.texas.gov/elections/vote…
Request for Postage Paid Voter Registration Form: webservices.sos.state.tx.us/vrrequest/inde…
thread
#earlyvote in #TEXAS
Find early voting locations here: sos.state.tx.us/elections/vote…
Or: teamrv-mvp.sos.texas.gov/MVP/mvp.do
Or contact County Election Boards here: sos.state.tx.us/elections/vote…
Early Voting for #Midterms2018: Oct 22, 2018 - Nov 2, 2018 (in person)
Early Voting by Mail return by Nov 6
Read 47 tweets
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(THREAD) BREAKING: Over DOJ and FBI objection, the Nunes Memo—compiled by GOP staffers of the House Permanent Select Committee on Intelligence—has been released by Trump and Nunes. Here's my analysis of it—as an attorney and someone who's researched the Steele Dossier for a year.
1/ First, here's a link to the controversial document—a document whose release required Nunes to invoke a HPSCI rule never used in *40 years*, and required a sitting president to go to war against his FBI for the first time since the FBI was led by Hoover. docs.house.gov/meetings/IG/IG…
2/ Second, understand that it's common practice in the justice system for law enforcement to use informants who have conflicts of interest to secure a warrant. Here, the informant, former MI6 Russia desk chief Chris Steele, didn't know who his client was and had no such conflict.
Read 74 tweets
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THREAD showing evidence I've come across that suggests the recent murder of a young Jewish man in California was committed by a neo-Nazi, possibly as a politically motivated killing. (Sat on this for a week waiting on editors but now bits of the info are already out, so fuck it).
On January 2nd a 19-year-old Jewish man went missing in southern California. He turned up dead on Jan 9th, buried in a shallow grave in Borrego Park (wikimapia.org/#lang=en&lat=3…). A former class-mate was arrested on suspicion of the murder on Jan 12th.
The deceased is Blaze Bernstein and the suspected killer--now charged with the murder--is Sam Woodward, 20. (Referred to here on out as Blaze and Sam). See the next tweet for the LA Times story.
Read 95 tweets
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Meltdown, Spectreで学ぶ高性能コンピュータアーキテクチャ、 @dev_msyksphinz 、2018/1/6 msyksphinz.hatenablog.com/entry/2018/01/…
勉強になります
分岐予測
danluu.com/branch-predict…

博論、2015


アーキ比較の修論
=>
Ref
"Dynamic Branch Prediction with Perceptrons", HPCA 2001 cs.utexas.edu/~lin/papers/hp…
"Neural Methods for Dynamic Branch Prediction", ACM TOCS, Nov 2002 cs.utexas.edu/~lin/papers/to…
D. Jiménez, PhD Thesis, 2002 repositories.lib.utexas.edu/handle/2152/11…
cs.utexas.edu/~lin/
faculty.cse.tamu.edu/djimenez/
=>
二つ前ツイの一つ目引用 RT：CGO 2015での発表

のベンチを Meltdown、Spectre対処パッチをあた環境で行ったらどういう影響が出るだろうか (性能低下？)。
ラストの Seznec教授 (IRISA/INRIA) は Alpha EV8 branch predictorデザイン等に参加された分岐予想研究の大家です。
Read 23 tweets
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Продолжая традицию @alphyna, это тред занимательных фактов про математику. От профессионала, понятно, по-русски, местами смешно. Поскольку \
@alphyna это математика, количество фактов = двоичному логарифму от числа ретвитов. По идее, я жду двух ретвитов, но мне сказали, что ждут. Поехали!
1. Старая русская школа считает, что математика — это искусство решения задач. Бурбаки считает целью — создать максимально широкую теорию.
Read 310 tweets

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