PDF (double-sided) - Physics Department, UCSB - University of ...
PDF (double-sided) - Physics Department, UCSB - University of ... PDF (double-sided) - Physics Department, UCSB - University of ...
7.3.4 Performance Addressing the Performance Requirement is a more pervasive task that spans not only the general design criteria, but also every single line of implementing code. It involves decisions like the exact choice of programming language for each module, the threading structure for multi-threaded Modules (specifically the LabRAD Manager), the binary layout of the protocol itself that influences parseability and the amount of traffic, etc. It also dictates in part the way in which the project needs to be broken up into Modules to allow for efficient implementation of concepts like pipelining and parallel processing. 7.3.5 Open-Source Due to its very general design, only a few Modules in our LabRAD Setup are specific to the experiment at hand. A large fraction of the system can be useful in many other labs that are facing the same issues, like code base maintainability, remote access, etc. We therefore decided to share the project with the world and publish it as open source software under the GPL license on SourceForge.net. This not only gives us access to the software maintenance tools that SourceForge provides, but also gives other developers from around the world a chance to join the project and share Modules with us which they developed but may become 136
useful to us in the future. Beyond that, it forces us to do a good job documenting the project which will be useful for future members joining the group. 7.4 Components The LabRAD platform consists of three fundamental components on which every experiment-specific implementation is built: The LabRAD Protocol defines the exact binary layout of the network packets that are exchanged between the different components. The LabRAD Manager routes packets between different Modules and provides some basic system features. The LabRAD APIs provide access to the LabRAD system from different programming languages. 7.4.1 LabRAD Protocol The LabRAD Protocol is designed for both speed and flexibility. Data is encapsulated in Packets that consist of routing and context information followed by an arbitrary number of Records that each wrap up one Request or Response for a Server’s Setting. The ability to send multiple Requests in one Packet can reduce network traffic significantly and can be used for other purposes like defining atomic operations, etc. LabRAD uses binary encoding of the data to reduce overhead. The Protocol 137
- Page 113 and 114: squid loop. Thus, this tool can be
- Page 115: now, amorphous silicon seems to pro
- Page 118 and 119: Figure 5.1: L-Edit Mask Layout Tool
- Page 120 and 121: Figure 5.2: Fabrication Building Bl
- Page 122 and 123: Figure 5.3: Photolithography and Et
- Page 124 and 125: times the removal can be a bit tric
- Page 126 and 127: Figure 5.4: Clearing Vias from Nati
- Page 128 and 129: 5.6 Junction Layers 5.6.1 Oxidation
- Page 130 and 131: top wiring layer to protect all low
- Page 132 and 133: 104
- Page 134 and 135: 6.1 Physical Quality Control during
- Page 136 and 137: 6.1.3 Atomic Force Microscopy To re
- Page 138 and 139: Figure 6.1: 4-Wire Measurement - a)
- Page 140 and 141: 6.3 Quantum Measurements at 25 mK 6
- Page 142 and 143: seems to be a box machined out of s
- Page 144 and 145: Figure 6.2: Dilution Refrigerator W
- Page 146 and 147: cessing data. This protects the vol
- Page 148 and 149: 6.3.9 Anritsu Microwave Source The
- Page 150 and 151: 122
- Page 152 and 153: ment, the scalability requirements,
- Page 154 and 155: people without any formal training
- Page 156 and 157: 7.2.4 Performance Last, but certain
- Page 158 and 159: or a Client Module. Client Modules
- Page 160 and 161: second Module talks to all these an
- Page 162 and 163: puters to talk to each other. Usual
- Page 166 and 167: is designed such that the LabRAD Ma
- Page 168 and 169: Table 7.3: LabRAD Type Annotations
- Page 170 and 171: listed in Table 7.3. For transmissi
- Page 172 and 173: Architecture to manage network conn
- Page 174 and 175: Manager. In fact, in our lab, the o
- Page 176 and 177: waiting for their completion. The C
- Page 178 and 179: mentation of pipelining and certain
- Page 180 and 181: Since the API guarantees that all R
- Page 182 and 183: one microwave line for X/Y-rotation
- Page 184 and 185: 7.5.3 DC Rack Server The DC Rack Se
- Page 186 and 187: data taking on the lab servers and
- Page 188 and 189: keys and the ability to set Context
- Page 190 and 191: a certain time. 7.5.9 Optimizer Cli
- Page 192 and 193: ters read from different sub-direct
- Page 194 and 195: efore the execution of the sequence
- Page 196 and 197: can achieve very-close-to hardware
- Page 198 and 199: type to provide a one-stop location
- Page 200 and 201: 172
- Page 202 and 203: 8.1 Squid I/V Response As explained
- Page 204 and 205: a digital signal via the use of a c
- Page 206 and 207: energy landscape (see Chapter 2.2.3
- Page 208 and 209: Figure 8.3: Squid Steps Failure Mod
- Page 210 and 211: At this point, the squid ramp can b
- Page 212 and 213: starts to tunnel to the neighboring
7.3.4 Performance<br />
Addressing the Performance Requirement is a more pervasive task that spans<br />
not only the general design criteria, but also every single line <strong>of</strong> implementing code.<br />
It involves decisions like the exact choice <strong>of</strong> programming language for each module,<br />
the threading structure for multi-threaded Modules (specifically the LabRAD<br />
Manager), the binary layout <strong>of</strong> the protocol itself that influences parseability and<br />
the amount <strong>of</strong> traffic, etc. It also dictates in part the way in which the project<br />
needs to be broken up into Modules to allow for efficient implementation <strong>of</strong> concepts<br />
like pipelining and parallel processing.<br />
7.3.5 Open-Source<br />
Due to its very general design, only a few Modules in our LabRAD Setup are<br />
specific to the experiment at hand. A large fraction <strong>of</strong> the system can be useful<br />
in many other labs that are facing the same issues, like code base maintainability,<br />
remote access, etc. We therefore decided to share the project with the world and<br />
publish it as open source s<strong>of</strong>tware under the GPL license on SourceForge.net.<br />
This not only gives us access to the s<strong>of</strong>tware maintenance tools that SourceForge<br />
provides, but also gives other developers from around the world a chance to join<br />
the project and share Modules with us which they developed but may become<br />
136
Change language