Brendan Gregg

OCTOBER 8, 2018

Screenshot: tracing read latency for PID 181: # bpftrace -e 'kprobe:vfs_read /pid == 30153/ { @start[tid] = nsecs; } kretprobe:vfs_read /@start[tid]/ { @ns = hist(nsecs - @start[tid]); delete(@start[tid]); }'. Back then I could already tell if disks were seeking by interpreting iostat(1) output: seeing high disk latency but small I/O.

C++ 110

C++ Virtualization Programming Latency 110

KeyCDN

JANUARY 31, 2019

The next closest active POP location to Bucharest was Istanbul which was still almost 900km away; this distance adds up in terms of latency. As of 2016, Bucharest alone had a population of over 1.83 million people. As for Romania, it covers an area of over 238,000 square kilometers and as of 2017 had a population of almost 20 million.

Internet 48

Internet Internet Ecommerce Speed 48

KeyCDN

OCTOBER 24, 2018

Although both countries are relatively close to one another, they are separated by a distance of approximately 500km, which adds up in terms of latency. As of 2016, there were just over 5.1 Before the implementation of our Helsinki POP, Finnish users were delivered content from our POP in Stockholm, Sweden. penetration rate.

Internet 48

Internet Internet Speed Network 48

Brendan Gregg

OCTOBER 7, 2018

Screenshot: tracing read latency for PID 181: # bpftrace -e 'kprobe:vfs_read /pid == 30153/ { @start[tid] = nsecs; } kretprobe:vfs_read /@start[tid]/ { @ns = hist(nsecs - @start[tid]); delete(@start[tid]); }'. Back then I could already tell if disks were seeking by interpreting iostat(1) output: seeing high disk latency but small I/O.

C++ 40

C++ Virtualization Programming Latency 40

Brendan Gregg

MAY 16, 2017

I previously wrote about Netflix in [2015] and [2016], and if you are interested in what it's like to work here, I already covered much in those posts. Instead, it has been a process of continual improvements, by many engineers across the company. ## A Day in the Life (Performance Engineering) What do I actually do all day?

Java 75

Java Entertainment Engineering Scalability 75

The Morning Paper

MAY 21, 2019

” This paper describes a “far memory” system that has been in production deployment at Google since 2016. This boils down to a single digit µs latency toleration in the tail for far memory, and in addition to security and privacy concerns, rules out remote memory solutions. Enter zswap!

Software 78

Software Software Google Hardware 78

KeyCDN

MARCH 10, 2021

It's our mission to continuously improve web performance and each POP contributes to it. The image below shows a significant drop in latency once we've launched the new point of presence in Israel. The image below shows a significant drop in latency once we've launched the new point of presence in Israel. With a population of 2.5

Latency 110

Latency Internet Internet Tuning 110