Brendan Gregg

AUGUST 18, 2019

For example, iostat(1), or a monitoring agent, may tell you your average disk latency, but not the distribution of this latency. For smaller environments, it can be of more use helping eliminate latency outliers. Kernel dynamic tracing of read() bytes bpftrace -e 'kretprobe:vfs_read { @bytes = lhist(retval, 0, 2000, 200) }'.

Latency 68

Latency C++ Cache Programming 68

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]); }'. Hit Ctrl-C to end.n"); } self int last[dev_t]; /* * Process io start */ io:genunix::start /self->last[args[0]->b_edev] !=

C++ 110

C++ Virtualization Programming Latency 110

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]); }'. Hit Ctrl-C to end.n"); } self int last[dev_t]; /* * Process io start */ io:genunix::start /self->last[args[0]->b_edev] !=

C++ 40

C++ Virtualization Programming Latency 40

SQL Server According to Bob

JANUARY 11, 2020

The ​​ SQL Server 2000 I/O Basics ​​ document is a prerequisite to ​​ the information contained in this ​​ document. and ​​ 2000. SQL Server 2000, and SQL Server 2005. ​​ Read it before you read this paper. SQL Server 6.

Servers 40

Servers Cache Database Media 40

Alex Russell

JUNE 20, 2020

3] Oh, and it should be imperatively programmed with Lisp-in-C's-clothing. full TCP/IP & UDP networking, including local network discovery. full TCP/IP & UDP networking, including local network discovery. Other use-cases weren't addressable with early 2000's tech. high-color image raster.

Hardware 55

Hardware Games Java Media 55