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  • Le profil des utilisateurs

    12 avril 2011, par

    Chaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
    L’utilisateur a accès à la modification de profil depuis sa page auteur, un lien dans la navigation "Modifier votre profil" est (...)

  • Configurer la prise en compte des langues

    15 novembre 2010, par

    Accéder à la configuration et ajouter des langues prises en compte
    Afin de configurer la prise en compte de nouvelles langues, il est nécessaire de se rendre dans la partie "Administrer" du site.
    De là, dans le menu de navigation, vous pouvez accéder à une partie "Gestion des langues" permettant d’activer la prise en compte de nouvelles langues.
    Chaque nouvelle langue ajoutée reste désactivable tant qu’aucun objet n’est créé dans cette langue. Dans ce cas, elle devient grisée dans la configuration et (...)

  • XMP PHP

    13 mai 2011, par

    Dixit Wikipedia, XMP signifie :
    Extensible Metadata Platform ou XMP est un format de métadonnées basé sur XML utilisé dans les applications PDF, de photographie et de graphisme. Il a été lancé par Adobe Systems en avril 2001 en étant intégré à la version 5.0 d’Adobe Acrobat.
    Étant basé sur XML, il gère un ensemble de tags dynamiques pour l’utilisation dans le cadre du Web sémantique.
    XMP permet d’enregistrer sous forme d’un document XML des informations relatives à un fichier : titre, auteur, historique (...)

Sur d’autres sites (8876)

  • Revision 29926 : On branche spip_piwik

    17 juillet 2009, par kent1@… — Log

    On branche spip_piwik

  • Cortex-A7 instruction cycle timings

    15 mai 2014, par Mans — ARM

    The Cortex-A7 ARM core is a popular choice in low-power and low-cost designs. Unfortunately, the public TRM does not include instruction timing information. It does reveal that execution is in-order which makes measuring the throughput and latency for individual instructions relatively straight-forward.

    The table below lists the measured issue cycles (inverse throughput) and result latency of some commonly used instructions.

    It should be noted that in some cases, the perceived latency depends on the instruction consuming the result. Most of the values were measured with the result used as input to the same instruction. For instructions with multiple outputs, the latencies of the result registers may also differ.

    Finally, although instruction issue is in-order, completion is out of order, allowing independent instructions to issue and complete unimpeded while a multi-cycle instruction is executing in another unit. For example, a 3-cycle MUL instruction does not block ADD instructions following it in program order.

    ALU instructions Issue cycles Result latency
    MOV Rd, Rm 1/2 1
    ADD Rd, Rn, #imm 1/2 1
    ADD Rd, Rn, Rm 1 1
    ADD Rd, Rn, Rm, LSL #imm 1 1
    ADD Rd, Rn, Rm, LSL Rs 1 1
    LSL Rd, Rn, #imm 1 2
    LSL Rd, Rn, Rs 1 2
    QADD Rd, Rn, Rm 1 2
    QADD8 Rd, Rn, Rm 1 2
    QADD16 Rd, Rn, Rm 1 2
    CLZ Rd, Rm 1 1
    RBIT Rd, Rm 1 2
    REV Rd, Rm 1 2
    SBFX Rd, Rn 1 2
    BFC Rd, #lsb, #width 1 2
    BFI Rd, Rn, #lsb, #width 1 2
    NOTE : Shifted operands and shift amounts needed one cycle early.
    Multiply instructions Issue cycles Result latency
    MUL Rd, Rn, Rm 1 3
    MLA Rd, Rn, Rm, Ra 1 31
    SMULL Rd, RdHi, Rn, Rm 1 3
    SMLAL Rd, RdHi, Rn, Rm 1 31
    SMMUL Rd, Rn, Rm 1 3
    SMMLA Rd, Rn, Rm, Ra 1 31
    SMULBB Rd, Rn, Rm 1 3
    SMLABB Rd, Rn, Rm, Ra 1 31
    SMULWB Rd, Rn, Rm 1 3
    SMLAWB Rd, Rn, Rm, Ra 1 31
    SMUAD Rd, Rn, Rm 1 3
    1 Accumulator forwarding allows back to back MLA instructions without delay.
    Divide instructions Issue cycles Result latency
    SDIV Rd, Rn, Rm 4-20 6-22
    UDIV Rd, Rn, Rm 3-19 5-21
    Load/store instructions Issue cycles Result latency
    LDR Rt, [Rn] 1 3
    LDR Rt, [Rn, #imm] 1 3
    LDR Rt, [Rn, Rm] 1 3
    LDR Rt, [Rn, Rm, lsl #imm] 1 3
    LDRD Rt, Rt2, [Rn] 1 3-4
    LDM Rn, regs 1-8 3-10
    STR Rt, [Rn] 1 2
    STRD Rt, Rt2, [Rn] 1 2
    STM Rn, regs 1-10 2-12
    NOTE : Load results are forwarded to dependent stores without delay.
    VFP instructions Issue cycles Result latency
    VMOV.F32 Sd, Sm 1 4
    VMOV.F64 Dd, Dm 1 4
    VNEG.F32 Sd, Sm 1 4
    VNEG.F64 Dd, Dm 1 4
    VABS.F32 Sd, Sm 1 4
    VABS.F64 Dd, Dm 1 4
    VADD.F32 Sd, Sn, Sm 1 4
    VADD.F64 Dd, Dn, Dm 1 4
    VMUL.F32 Sd, Sn, Sm 1 4
    VMUL.F64 Dd, Dn, Dm 4 7
    VMLA.F32 Sd, Sn, Sm 1 81
    VMLA.F64 Dd, Dn, Dm 4 112
    VFMA.F32 Sd, Sn, Sm 1 81
    VFMA.F64 Dd, Dn, Dm 5 82
    VDIV.F32 Sd, Sn, Sm 15 18
    VDIV.F64 Dd, Dn, Dm 29 32
    VSQRT.F32 Sd, Sm 14 17
    VSQRT.F64 Dd, Dm 28 31
    VCVT.F32.F64 Sd, Dm 1 4
    VCVT.F64.F32 Dd, Sm 1 4
    VCVT.F32.S32 Sd, Sm 1 4
    VCVT.F64.S32 Dd, Sm 1 4
    VCVT.S32.F32 Sd, Sm 1 4
    VCVT.S32.F64 Sd, Dm 1 4
    VCVT.F32.S32 Sd, Sd, #fbits 1 4
    VCVT.F64.S32 Dd, Dd, #fbits 1 4
    VCVT.S32.F32 Sd, Sd, #fbits 1 4
    VCVT.S32.F64 Dd, Dd, #fbits 1 4
    1 5 cycles with dependency only on accumulator.
    2 8 cycles with dependency only on accumulator.
    NEON integer instructions Issue cycles Result latency
    VADD.I8 Dd, Dn, Dm 1 4
    VADDL.S8 Qd, Dn, Dm 2 4
    VADD.I8 Qd, Qn, Qm 2 4
    VMUL.I8 Dd, Dn, Dm 2 4
    VMULL.S8 Qd, Dn, Dm 2 4
    VMUL.I8 Qd, Qn, Qm 4 4
    VMLA.I8 Dd, Dn, Dm 2 4
    VMLAL.S8 Qd, Dn, Dm 2 4
    VMLA.I8 Qd, Qn, Qm 4 4
    VADD.I16 Dd, Dn, Dm 1 4
    VADDL.S16 Qd, Dn, Dm 2 4
    VADD.I16 Qd, Qn, Qm 2 4
    VMUL.I16 Dd, Dn, Dm 1 4
    VMULL.S16 Qd, Dn, Dm 2 4
    VMUL.I16 Qd, Qn, Qm 2 4
    VMLA.I16 Dd, Dn, Dm 1 4
    VMLAL.S16 Qd, Dn, Dm 2 4
    VMLA.I16 Qd, Qn, Qm 2 4
    VADD.I32 Dd, Dn, Dm 1 4
    VADDL.S32 Qd, Dn, Dm 2 4
    VADD.I32 Qd, Qn, Qm 2 4
    VMUL.I32 Dd, Dn, Dm 2 4
    VMULL.S32 Qd, Dn, Dm 2 4
    VMUL.I32 Qd, Qn, Qm 4 4
    VMLA.I32 Dd, Dn, Dm 2 4
    VMLAL.S32 Qd, Dn, Dm 2 4
    VMLA.I32 Qd, Qn, Qm 4 4
    NEON floating-point instructions Issue cycles Result latency
    VADD.F32 Dd, Dn, Dm 2 4
    VADD.F32 Qd, Qn, Qm 4 4
    VMUL.F32 Dd, Dn, Dm 2 4
    VMUL.F32 Qd, Qn, Qm 4 4
    VMLA.F32 Dd, Dn, Dm 2 81
    VMLA.F32 Qd, Qn, Qm 4 81
    1 5 cycles with dependency only on accumulator.
    NEON permute instructions Issue cycles Result latency
    VEXT.n Dd, Dn, Dm, #imm 1 4
    VEXT.n Qd, Qn, Qm, #imm 2 5
    VTRN.n Dd, Dn, Dm 2 5
    VTRN.n Qd, Qn, Qm 4 5
    VUZP.n Dd, Dn, Dm 2 5
    VUZP.n Qd, Qn, Qm 4 6
    VZIP.n Dd, Dn, Dm 2 5
    VZIP.n Qd, Qn, Qm 4 6
    VTBL.8 Dd, Dn, Dm 1 4
    VTBL.8 Dd, Dn-Dn+1, Dm 1 4
    VTBL.8 Dd, Dn-Dn+2, Dm 2 5
    VTBL.8 Dd, Dn-Dn+3, Dm 2 5

  • Running a py script in the Cloud

    12 janvier 2018, par Anay Bose

    I’m new to Google’s cloud & Virtual Machine(VM) instances, and I need some clarifications on a couple of points. I have a python script ; it imports a long range of functions. I need to run those functions in parallel. I’m using multiprocessing and Process, not threads. These functions are basically image and media processors, and they use many other tools like FFMPEG, imagemagick and Avisynth in addition to a wide range of python modules, including moviepy. Now, I would like to run some 50 functions in parallel assigning a CPU for each process. Images, media and avi files are stored in seperate folders. I’m on Windows7 Core-i7 machine. So, need cloud computing power.

    Now, my question can I run such a python script/app in the cloud that requires a very complicated file system and non-python tools i.e. ffmpeg, avisynth and avi files ?

    Can Google VMs emulate my local machine and empower me with more cores and memory to run such a program ? if not, then what are my options ? Is their any tutorials that I can follow ? I need your suggestions. I have given below an example script and some codes to help facilitate your understanding about my situation.

    from __future__ import unicode_literals
    
import youtube_dl
    
import os
    
import time
    
import sys
    
reload(sys)  
    
sys.setdefaultencoding('utf-8')
    
from multiprocessing import Process
    
from utils import *
    

    
from clip31 import VIDEO31
    
from clip32 import VIDEO32
    
from clip189 import VIDEO189
    
from clip16 import VIDEO16
    
from clip39 import VIDEO39
    

    

    
if __name__== '__main__':
    

    
    # 1. CALLING A FUNCTION
    
    folder = "bodyforce3\\16"
    
    serial = "16"
    
    images = get_filepaths("../16")
    
    videos = get_filepaths("12__media")
    
    pngs = get_filepaths("../pngs")
    

    
    Process(target=VIDEO192, args=(folder, serial, color1, color2, color3, images, videos)).start()
    

    

    
    # 2. CALLING A FUNCTION
    
    folder = "bodyforce3\\20"
    
    serial = "20"
    
    images = get_filepaths("../20")
    
    videos = get_filepaths("18__media")
    

    
    Process(target=VIDEO32, args=(folder, serial, color1, color2, color3, images, videos)).start()
    

    

    
    # 3. CALLING A FUNCTION
    
    folder = "bodyforce3\\14"
    
    serial = "14"
    
    images = get_filepaths("../14")
    
    videos = get_filepaths("16__media")
    

    
    Process(target=VIDEO91, args=(folder, serial, color1, color2, color3, images, videos)).start()

    I copy avi files in functions like this :

    src = "clip50_files"
    
src_files = os.listdir(src)
    
for file_name in src_files:
    
    full_file_name = os.path.join(src, file_name)
    
    if (os.path.isfile(full_file_name)):
    
        shutil.copy(full_file_name, folder)

    I call ffmpeg commands like this, and they are included within py functions.

    ###########################
    
#### FFMPEG OPERATIONS ####
    
###########################
    

    
print "Starting FFMPEG operations ..."
    

    
if os.path.isfile(os.path.join(folder, "bounce-(3).avi")):
    
    os.remove(os.path.join(folder, "bounce-(3).avi"))
    

    

    
infile = folder + "/bounce-(3).avs"
    
outfile = folder + "/bounce-(3).avi"
    
codec = "rawvideo"
    
pix_fmt = "bgra"
    

    
try:
    
    subprocess.call(["ffmpeg",
    
                     "-i" ,infile, 
    
                     "-c:v" ,codec, 
    
                     "-pix_fmt", pix_fmt, 
    
                     outfile],
    
                    stdout=open(os.devnull, 'w'), 
    
                    stderr=subprocess.STDOUT)
    
except subprocess.CalledProcessError as e:   
    
    #except subprocess.CalledProcessError as e:
    
    sys.exit(e.output)
    
except OSError as e:
    
    sys.exit(e.strerror)
    

    

    
print "FFMPEG operations ended"

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