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Bartosz Taudul 2020-07-17 22:40:45 +02:00
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@ -1798,37 +1798,43 @@ The new file contains the same data as the old one, but in the updated internal
\subsubsection{Archival mode} \subsubsection{Archival mode}
The update utility supports optional higher levels of data compression, which reduce disk size of traces, at the cost of increased compression times. With the default settings, the output files have a reasonable size and are quick to save and load. A list of available compression modes, parameters that enable them, and compression results is available in table~\ref{compressiontimes} and figures~\ref{savesize}, \ref{savetime} and~\ref{loadtime}. The \texttt{update} utility supports optional higher levels of data compression, which reduce disk size of traces, at the cost of increased compression times. With the default settings, the output files have a reasonable size and are quick to save and load. A list of available compression modes and their respective results is available in table~\ref{compressiontimes} and figures~\ref{savesize}, \ref{savetime} and~\ref{loadtime}. Compression mode selection is controlled by the following command line options:
\begin{itemize}
\item \texttt{-h} -- enables LZ4 HC compression.
\item \texttt{-e} -- uses LZ4 extreme compression.
\item \texttt{-z level} -- selects Zstandard algorithm, with a specified compression level.
\end{itemize}
\begin{table}[h] \begin{table}[h]
\centering \centering
\begin{tabular}[h]{c|c|c|c|c} \begin{tabular}[h]{c|c|c|c|c}
\textbf{Mode} & \textbf{Size} & \textbf{Ratio} & \textbf{Save time} & \textbf{Load time} \\ \hline \textbf{Mode} & \textbf{Size} & \textbf{Ratio} & \textbf{Save time} & \textbf{Load time} \\ \hline
\emph{default} & 162.48 MB & 17.19\% & 1.91 \si{\second} & 470 \si{\milli\second} \\ \emph{default} & 162.48 MB & 17.19\% & 1.91 \si{\second} & 470 \si{\milli\second} \\
\texttt{-{}-hc} & 77.33 MB & 8.18\% & 39.24 \si{\second} & 401 \si{\milli\second} \\ \texttt{hc} & 77.33 MB & 8.18\% & 39.24 \si{\second} & 401 \si{\milli\second} \\
\texttt{-{}-extreme} & 72.67 MB & 7.68\% & 4:30 & 406 \si{\milli\second} \\ \hline \texttt{extreme} & 72.67 MB & 7.68\% & 4:30 & 406 \si{\milli\second} \\ \hline
\texttt{-{}-zstd 1} & 63.17 MB & 6.68\% & 2.27 \si{\second} & 868 \si{\milli\second} \\ \texttt{zstd 1} & 63.17 MB & 6.68\% & 2.27 \si{\second} & 868 \si{\milli\second} \\
\texttt{-{}-zstd 2} & 63.29 MB & 6.69\% & 2.31 \si{\second} & 884 \si{\milli\second} \\ \texttt{zstd 2} & 63.29 MB & 6.69\% & 2.31 \si{\second} & 884 \si{\milli\second} \\
\texttt{-{}-zstd 3} & 62.94 MB & 6.65\% & 2.43 \si{\second} & 867 \si{\milli\second} \\ \texttt{zstd 3} & 62.94 MB & 6.65\% & 2.43 \si{\second} & 867 \si{\milli\second} \\
\texttt{-{}-zstd 4} & 62.81 MB & 6.64\% & 2.44 \si{\second} & 855 \si{\milli\second} \\ \texttt{zstd 4} & 62.81 MB & 6.64\% & 2.44 \si{\second} & 855 \si{\milli\second} \\
\texttt{-{}-zstd 5} & 61.04 MB & 6.45\% & 3.98 \si{\second} & 855 \si{\milli\second} \\ \texttt{zstd 5} & 61.04 MB & 6.45\% & 3.98 \si{\second} & 855 \si{\milli\second} \\
\texttt{-{}-zstd 6} & 60.27 MB & 6.37\% & 4.19 \si{\second} & 827 \si{\milli\second} \\ \texttt{zstd 6} & 60.27 MB & 6.37\% & 4.19 \si{\second} & 827 \si{\milli\second} \\
\texttt{-{}-zstd 7} & 61.53 MB & 6.5\% & 6.6 \si{\second} & 761 \si{\milli\second} \\ \texttt{zstd 7} & 61.53 MB & 6.5\% & 6.6 \si{\second} & 761 \si{\milli\second} \\
\texttt{-{}-zstd 8} & 60.44 MB & 6.39\% & 7.84 \si{\second} & 746 \si{\milli\second} \\ \texttt{zstd 8} & 60.44 MB & 6.39\% & 7.84 \si{\second} & 746 \si{\milli\second} \\
\texttt{-{}-zstd 9} & 59.58 MB & 6.3\% & 9.6 \si{\second} & 724 \si{\milli\second} \\ \texttt{zstd 9} & 59.58 MB & 6.3\% & 9.6 \si{\second} & 724 \si{\milli\second} \\
\texttt{-{}-zstd 10} & 59.36 MB & 6.28\% & 10.29 \si{\second} & 706 \si{\milli\second} \\ \texttt{zstd 10} & 59.36 MB & 6.28\% & 10.29 \si{\second} & 706 \si{\milli\second} \\
\texttt{-{}-zstd 11} & 59.2 MB & 6.26\% & 11.23 \si{\second} & 717 \si{\milli\second} \\ \texttt{zstd 11} & 59.2 MB & 6.26\% & 11.23 \si{\second} & 717 \si{\milli\second} \\
\texttt{-{}-zstd 12} & 58.51 MB & 6.19\% & 15.43 \si{\second} & 695 \si{\milli\second} \\ \texttt{zstd 12} & 58.51 MB & 6.19\% & 15.43 \si{\second} & 695 \si{\milli\second} \\
\texttt{-{}-zstd 13} & 56.16 MB & 5.94\% & 35.55 \si{\second} & 642 \si{\milli\second} \\ \texttt{zstd 13} & 56.16 MB & 5.94\% & 35.55 \si{\second} & 642 \si{\milli\second} \\
\texttt{-{}-zstd 14} & 55.76 MB & 5.89\% & 37.74 \si{\second} & 627 \si{\milli\second} \\ \texttt{zstd 14} & 55.76 MB & 5.89\% & 37.74 \si{\second} & 627 \si{\milli\second} \\
\texttt{-{}-zstd 15} & 54.65 MB & 5.78\% & 1:01 & 600 \si{\milli\second} \\ \texttt{zstd 15} & 54.65 MB & 5.78\% & 1:01 & 600 \si{\milli\second} \\
\texttt{-{}-zstd 16} & 50.94 MB & 5.38\% & 1:34 & 537 \si{\milli\second} \\ \texttt{zstd 16} & 50.94 MB & 5.38\% & 1:34 & 537 \si{\milli\second} \\
\texttt{-{}-zstd 17} & 50.18 MB & 5.30\% & 1:44 & 542 \si{\milli\second} \\ \texttt{zstd 17} & 50.18 MB & 5.30\% & 1:44 & 542 \si{\milli\second} \\
\texttt{-{}-zstd 18} & 49.91 MB & 5.28\% & 2:17 & 554 \si{\milli\second} \\ \texttt{zstd 18} & 49.91 MB & 5.28\% & 2:17 & 554 \si{\milli\second} \\
\texttt{-{}-zstd 19} & 46.99 MB & 4.97\% & 7:09 & 605 \si{\milli\second} \\ \texttt{zstd 19} & 46.99 MB & 4.97\% & 7:09 & 605 \si{\milli\second} \\
\texttt{-{}-zstd 20} & 46.81 MB & 4.95\% & 7:08 & 608 \si{\milli\second} \\ \texttt{zstd 20} & 46.81 MB & 4.95\% & 7:08 & 608 \si{\milli\second} \\
\texttt{-{}-zstd 21} & 45.77 MB & 4.84\% & 13:01 & 614 \si{\milli\second} \\ \texttt{zstd 21} & 45.77 MB & 4.84\% & 13:01 & 614 \si{\milli\second} \\
\texttt{-{}-zstd 22} & 45.52 MB & 4.81\% & 15:11 & 621 \si{\milli\second} \texttt{zstd 22} & 45.52 MB & 4.81\% & 15:11 & 621 \si{\milli\second}
\end{tabular} \end{tabular}
\caption{Compression results for an example trace. \\ Tests performed on Ryzen 9 3900X.} \caption{Compression results for an example trace. \\ Tests performed on Ryzen 9 3900X.}
\label{compressiontimes} \label{compressiontimes}
@ -1901,6 +1907,24 @@ Trace files created using the \emph{default}, \emph{hc} and \emph{extreme} modes
For archival purposes it is however much better to use the \emph{zstd} compression modes, which are faster, compress trace files more tightly, and are directly loadable by the profiler, without the intermediate decompression step. For archival purposes it is however much better to use the \emph{zstd} compression modes, which are faster, compress trace files more tightly, and are directly loadable by the profiler, without the intermediate decompression step.
\subsubsection{Data removal}
In some cases you may want to share just a portion of the trace file, omitting sensitive data such as source file cache, or machine code of the symbols. This can be achieved using the \texttt{-s flags} command line option. To select what kind of data is to be stripped, you need to provide a list of flags selected from the following:
\begin{itemize}
\item \texttt{l} -- locks.
\item \texttt{m} -- messages.
\item \texttt{p} -- plots.
\item \texttt{M} -- memory.
\item \texttt{i} -- frame images.
\item \texttt{c} -- context switches.
\item \texttt{s} -- sampling data.
\item \texttt{C} -- symbol code.
\item \texttt{S} -- source file cache.
\end{itemize}
Flags can be concatenated, for example specifying \texttt{-s CSi} will remove symbol code, source file cache and frame images in the destination trace file.
\subsection{Instrumentation failures} \subsection{Instrumentation failures}
\label{instrumentationfailures} \label{instrumentationfailures}