org.eclipse.linuxtools.lttng.help/html/limitations/limitations.html

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  11 <H1>Limitations</H1>
  12 <P>The current implementation is still under heavy development and
  13 some important features are still missing.<BR>Here is a list of the
  14 known bugs and missing features that are worked on.</P>
  15 <UL>
  16         <LI><P STYLE="margin-bottom: 0cm"><B>Thread issues affect
  17         performance</B></P>
  18         <P STYLE="margin-bottom: 0cm; font-weight: normal">The multi-thread
  19         access to the traces is mostly turned off for now so the user might
  20         experiment a very long load time when opening a trace and/or
  21         zooming. Of course, this is especially true for big trace.</P>
  22         <P STYLE="margin-bottom: 0cm"><SPAN STYLE="font-weight: normal">In
  23         the future, the traces with be opened and indexed asynchronously,
  24         with the result of greatly improved performance.</SPAN></P>
  25 </UL>
  26 <P STYLE="margin-bottom: 0cm"><BR>
  27 </P>
  28 <UL>
  29         <LI><P STYLE="margin-bottom: 0cm"><B>No support for individual traces</B></P>
  30         <P STYLE="margin-bottom: 0cm">The code for loading and parsing an individual
  31         trace (not part of an experiment) is currently disabled. As a workaround,
  32         just create an experiment with the single trace you want to analyze.
  33         </P>
  34 </UL>
  35 <P STYLE="margin-bottom: 0cm"><BR>
  36 </P>
  37 <UL>
  38         <LI><P STYLE="margin-bottom: 0cm"><B>One trace per experiment is
  39         currently supported</B></P>
  40         <P STYLE="margin-bottom: 0cm">Work to be able to merge and index
  41         several traces into a single experiment have not being completed
  42         yet.
  43         </P>
  44         <P STYLE="margin-bottom: 0cm">In the future, it will be possible to
  45         process several traces at once and to compare them in the views.</P>
  46 </UL>
  47 <P STYLE="margin-bottom: 0cm"><BR>
  48 </P>
  49 <UL>
  50     <LI><P STYLE="margin-bottom: 0cm"><B>Time Frame View</B></P>
  51     <P STYLE="margin-bottom: 0cm">In some cases, the End Time of the Time
  52     Frame view is not set correctly (symptom: the nanoseconds are identical
  53     to the Start Time nanoseconds and the Interval nanoseconds = 0).
  54     <P STYLE="margin-bottom: 0cm">
  55     To set it properly, just spin up the End Time seconds field.
  56 </UL>
  57 <P STYLE="margin-bottom: 0cm"><BR>
  58 </P>
  59 <UL>
  60         <LI><P STYLE="margin-bottom: 0cm"><B>Simultaneous data requests</B></P>
  61         <P STYLE="margin-bottom: 0cm">All views are currently working on a
  62         standalone basis. Therefore, time selection synchronization among
  63         views does not trigger simultaneous data requests, which heavily
  64         hurts the performance of the application.
  65         </P>
  66         <P STYLE="margin-bottom: 0cm">In the future, data request will be
  67         centralized in the application, resulting in better response time in
  68         and between views.</P>
  69 </UL>
  70 <P STYLE="margin-bottom: 0cm"><BR>
  71 </P>
  72 <UL>
  73         <LI><P STYLE="margin-bottom: 0cm"><B>No trace recording capability
  74         in Eclipse yet</B></P>
  75         <P STYLE="margin-bottom: 0cm">It is not currently possible to record
  76         a new trace directly in Eclipse, an user that would like to record a
  77         new trace would need to use external tools, like LTTv.</P>
  78         <P STYLE="margin-bottom: 0cm">In the future, a &ldquo;Control view&rdquo;
  79         will be provided for the user to allow him to easily a new trace
  80         inside Eclipse. It should also be possible to start the recording on
  81         a remote host from that view.</P>
  82 </UL>
  83 <P STYLE="margin-bottom: 0cm"><BR>
  84 </P>
  85 <UL>
  86         <LI><P STYLE="margin-bottom: 0cm"><B>Experimental Multi-CPU support</B></P>
  87         <P STYLE="margin-bottom: 0cm">Although working, some more work need
  88         to be done on trace that handle multiple processors. It is reputed
  89         to work already but this feature is mostly untested for now.</P>
  90         <P STYLE="margin-bottom: 0cm">In the future, multi-CPU should be
  91         supported and work as well as uni-CPU traces.</P>
  92 </UL>
  93 <P STYLE="margin-bottom: 0cm"><BR>
  94 </P>
  95 <UL>
  96         <LI><P STYLE="margin-bottom: 0cm"><B>Experimental 64 bits and/or non
  97         x86 architecture implementation</B></P>
  98         <P STYLE="margin-bottom: 0cm">The code used to read and parse files
  99         have not been extensively tested on 64 bits and was not tested at
 100         all on architecture different than x86 computer. The code is
 101         believed to work on a broad horizon of architecture but this cannot
 102         be certified for now.</P>
 103         <P STYLE="margin-bottom: 0cm">In the future, all x86 (32 and 64
 104         bits) as well as all PPC (32 and 64 bits) should work and possibly
 105         some (all?) models of SPARC.
 106         </P>
 107 </UL>
 108 <P STYLE="margin-bottom: 0cm"><BR>
 109 </P>
 110 <UL>
 111         <LI><P STYLE="margin-bottom: 0cm"><B>Missing filters and ordering on
 112         all views</B></P>
 113         <P STYLE="margin-bottom: 0cm">There is currently no way to filter
 114         events following some criteria or to dynamically sort the different
 115         fields.
 116         </P>
 117         <P STYLE="margin-bottom: 0cm">In the future, both should be
 118         implemented.
 119         </P>
 120 </UL>
 121 <P STYLE="margin-bottom: 0cm"><BR>
 122 </P>
 123 <UL>
 124         <LI><P STYLE="margin-bottom: 0cm"><B>Some views missing and/or need
 125         more work</B></P>
 126         <P>Some more views (&ldquo;Control&rdquo;, &ldquo;Histogram&rdquo;,
 127         etc...) are currently missing but planned in the Eclipse
 128         implementation and some others (&ldquo;Statistics&rdquo;) are
 129         working but need more work to be brought were they need to be.<BR>In
 130         the future, all views provided by LTTv will be supported in Eclipse
 131         and more!</P>
 132 </UL>
 133 <P><BR><BR>
 134 </P>
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