Parallel transfer software

Details on what information should be submitted are contained in appendix D of the NPB 2. This information includes:. Vendors and others implement the detailed specifications in the original "pencil and paper" benchmark specifications, using algorithms and programming models appropriate to their different machines. Submitted results are verified by the NAS Division.

These results are compiled in tabular fashion in periodic reports that will appear on this web page. Details on what information to include are contained in section 1. A variation of the grid benchmarks called "Rapid Fire" is included. Reports on implementations: GridNPB 3. Best wishes, Lei.

This should get you close. Thanks, Andrew. Thanks again. Best regards, Gabriel Chiodo. Hi Gabriel, I sympathize with your plight. We can ask around about that your option 2. As you said, you could try by re-setting all the namelist settings. At visible wavelengths clouds servations from the ARM Microwave Radiometer produce large variations in transmission over the typi- that were available for afternoon hours only to verify cal range of cloud optical thickness.

It is currently that vertical integration of water vapor profiles from extremely difficult to constrain models with accurate the radiosondes agree to within a few percent of the estimates of cloud optical depth and microphysics.

It is at dobson units, which was the midday value mea- therefore essential to obtain along with the surface SW sured by the Total Ozone Mapping Spectrometer in- measurements, a set of high-quality atmospheric ob- strument on the Earth Probe Satellite. Such high-quality data was used with observations from the Multifilter Vol. These values were extremely We have also compared SBDART to measure- stable, with morning and afternoon regressions agree- ments made with an accurately calibrated narrowband ing to within a few percent.

Measurements from tower- under clear skies. These observations were obtained mounted up- and down-looking MFRSRs provided under conditions of very low aerosol loading, for spectral surface albedo near the central facility which assumptions regarding aerosol properties are Michalsky , personal communication.

Unfortunately, the instrument used in As shown in Fig. This discrepancy is 4. Comparisons with observations on other days show a similar overestimate of the diffuse radia- tion. A potential source for this discrep- ancy may be an incorrect choice of aerosol scattering parameters.

These input values decreased the predicted diffuse radiation to a level within a few percent of the ob- servations Fig. A similar improve- ment can be obtained by fixing the FIG. Though the scattering properties tions for the same day. The aerosol single-scattering albedo and asymmetry fac- tor were set to 0.

Through the use of a simple neous value of the solar constant modified by earth— graphical user interface GUI anyone may carry out sun distance is used. Our goals in doing so include both educa- ance information is computed. These angles specify tion and research. The azimuth angle transfer or climate change. Perhaps this could be ex- is measured clockwise from the horizontal projection tended to undergraduate or even high school students. Results from these been by research scientists who lack the resources or calculations are presented in the form of tables or inclination to develop or implement their own radia- graphics.

Conclusions time, as an aid in design of satellite borne instruments, and as an analysis tool for atmospheric radiometric In this paper we have described SBDART, a newly data. Because of its rela- ried out through the GUI: broadband radiance, and tive ease of use and modular design, it should have spectral and broadband irradiance. The user chooses widespread use in the geoscience community, as a re- from various options for these calculations, replacing search code, an educational tool, and a basis for the default values for such parameters as solar zenith construction of new radiative transfer applications.

Custom input forms present the user with only those choices necessary for the calculation desired. One of these forms is illustrated in Fig.

Any of the six U. Alterna- tively, the user may specify an instrumental filter func- tion that is flat between arbitrary wavelengths.

For broadband and spectral calculations, the user may specify the solar zenith angle degrees , in which case the yearly average solar constant is used Neckel and Labs , or may specify a location, date, and time, in which case solar zenith angle and instanta- FIG. We anticipate that the Web version will be tested Appendix: Operational features and over a broader range of applications than we alone can examples provide. We hope the resulting user feedback will help us expedite the process of model improvement.

Extensive input documenta- researchers to share their software tools with the com- tion is included in the release package. Minimum munity. In the mean time we solicit suggestions for system requirements for a stand-alone installation are improvements in the implementation or presentation a FORTRAN compiler and 2.

The time required to complete an SBDART simulation depends on the number of radiation streams used to resolve the angu- lar radiance distribution and the number of quadrature points used to resolve the spectral range. For example, the computation of total SW — nm using 5 nm spectral resolution and four radiation streams takes about 40 s on a Pentium Pro MHz system.

Since most of the code inputs have been initialized with reasonable default values, a new user can quickly learn how to use the code, concentrating first on specifying just a few in- teresting input parameters.

Online documentation is provided which FIG. To take full advan- is 5. This of viewing zenith and azimuth angles is set by param- results in 10 times better resolution than shown in the eters NZEN and NPHI, respectively, while the param- eters UZEN and PHI specify zenith angles and relative azimuth angles at which the radiance information is generated see Fig.

In the previous example, the input parameter NSTR, which sets the number of in- ternal radiation streams, was left at its default value of 4 four polar angles and four azimuthal modes. As a result, given the same wavelength integration interval, the calculation of radiance takes much longer than irradiance.

A similar top of the atmosphere dotted and at the surface solid. Iacono, and J. Moncet, Line-by- line calculations of atmospheric fluxes and cooling rates: Ap- plication to water vapor.

Dahlback, A. Stamnes, A new spherical model for computing the radiation field available for photolysis and heat- ing at twilight. Space Sci. Ellingson, R. Hansen, J. Kato, S. Ackerman, E. Clothiaux, J. Mather, G. Mace, M. Wesely, F. Murcray, and J. Michalsky, Un- certainties in modeled and measured clear-sky surface short- Fig. The horizontal axis of each semicircle de- wave irradiances. Shettle, W. Gallery, J. Chetwynd, upwelling directed radiation shown in the upper panel L.

Abreu, J. Selby, S. Sharing the growing load naturally degrades the performance available to each client. Additionally, such systems are inherently fragile. With a single source of content at the servers, you introduce single points of failure that can result in complete downtime for an application. An unpredictable burst of demand could be more easily shared and building capacity closer to clients improves performance.

Such innovations made the early client - server model a little more robust, but at considerable cost to large filing sharing. Examples of the client - server model in common use include most web content, search engines, cloud computing applications and even common tools like FTP and rsync. Peer to peer systems are fundamentally different and are the fastest way to transfer files.

In this way peer to peer systems become organically scalable in addition to transferring large files fast. As more demand emerges for any content, so does more supply. As demand grows, the P2P connection system becomes incredibly fault tolerant and actually gets faster for large files, in sharp contrast to the client server model, which gets noticeably slower, and more fragile under the same circumstances. To summarize this section, peer to peer has several advantages:.