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GDB Threading Cheat Sheet

Designed for multi-threaded, multi-process, and advanced use cases. Convert with:

pandoc -o gdb-advanced.odt gdb-advanced.md

and play with the odt until happy, then export as .pdf.

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GDB Cheat Sheet

Starting & Running

Command	Description
gdb <program>	Start GDB with the specified program.
gdb -q	Start quietly (no intro).
run [args]	Run program with optional args.
start	Run until main() and break.
attach <pid>	Attach to a running process.

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/** Convenience functions to stream output from std:: data structures.
 *
 * Useful when you do not have a debugger.  See test below to get a sense of
 * what's available.
 *
 */

#include <gmock/gmock.h>
#include <gtest/gtest.h>

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Outlook shortcuts

If you remember only one shortcut!

• Insert Flag email (will show in your todo), then cycle un/complete.
• Alt+Insert: remove flag.
• Shift+F10 brings up the context menu (works everywhere)
• F3 or Ctrl+E: search

Actions

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; Simulate clients writing log files to a drive with fio (see https://bsdio.com/fio/)
;
; numbjobs: number of clients
; rate_iops: number of writes per seconds
; bs: size of the log entry
; size: total size of the log file
;
; Normally, the iops reported by fio should be rate_iops x numbjobs

[global]

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import numpy as np
import numexpr as ne
import pandas as pd
import matplotlib
import matplotlib.pyplot as plt

%load_ext autoreload
%autoreload 2

%matplotlib inline

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import pandas as pd

def top(df, n, columns=None):
    """Returns top and bottom n elements subset of input dataframe.

    Args:
        df: input dataframe.
        n: number of elements to return (n / 2 on top and on the bottom).
        columns: list of columns to consider for sorting, defaults to use
            head and tail.

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def add_data_frame_equality_func(test):
    """Define test class to handle assertEqual with `pandas.DataFrame`."""
    def frame_equal(lhs, rhs, msg=None):
        """Adapter for pandas.testing.assert_frame_equal."""
        if msg:
            try:
                pdt.assert_frame_equal(lhs, rhs)
            except AssertionError as err:
                raise test.failureException(msg)
        else:

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-- creates fdw to the database quotes in a schema quotes_s

create extension if not exists postgres_fdw;

create server prod_s foreign data wrapper postgres_fdw options (host 'servername', dbname 'quotes', port '5432');

create user mapping for public server prod_s options (user 'name', password 'secret'); 

create schema quotes_s;

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sns.set(style='whitegrid', context='notebook', font_scale=1.5)
sns.pairplot(df[cols])
plt.show()